Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 6197:d2a62e0f25eb
6995781: Native Memory Tracking (Phase 1)
7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain
author | zgu |
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date | Thu, 28 Jun 2012 17:03:16 -0400 |
parents | b632e80fc9dc |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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/parallelScavenge/adjoiningGenerations.hpp" | |
27 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" | |
28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" | |
29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
30 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp" | |
32 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
33 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
35 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" | |
36 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
37 #include "gc_implementation/parallelScavenge/vmPSOperations.hpp" | |
38 #include "memory/gcLocker.inline.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "runtime/handles.inline.hpp" | |
41 #include "runtime/java.hpp" | |
42 #include "runtime/vmThread.hpp" | |
6197 | 43 #include "services/memTracker.hpp" |
1972 | 44 #include "utilities/vmError.hpp" |
0 | 45 |
46 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
47 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
48 PSPermGen* ParallelScavengeHeap::_perm_gen = NULL; | |
49 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
50 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
51 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
52 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
53 | |
54 static void trace_gen_sizes(const char* const str, | |
55 size_t pg_min, size_t pg_max, | |
56 size_t og_min, size_t og_max, | |
57 size_t yg_min, size_t yg_max) | |
58 { | |
59 if (TracePageSizes) { | |
60 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
61 SIZE_FORMAT "," SIZE_FORMAT " " | |
62 SIZE_FORMAT "," SIZE_FORMAT " " | |
63 SIZE_FORMAT, | |
64 str, pg_min / K, pg_max / K, | |
65 og_min / K, og_max / K, | |
66 yg_min / K, yg_max / K, | |
67 (pg_max + og_max + yg_max) / K); | |
68 } | |
69 } | |
70 | |
71 jint ParallelScavengeHeap::initialize() { | |
1166 | 72 CollectedHeap::pre_initialize(); |
73 | |
0 | 74 // Cannot be initialized until after the flags are parsed |
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75 // GenerationSizer flag_parser; |
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76 _collector_policy = new GenerationSizer(); |
0 | 77 |
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78 size_t yg_min_size = _collector_policy->min_young_gen_size(); |
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79 size_t yg_max_size = _collector_policy->max_young_gen_size(); |
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80 size_t og_min_size = _collector_policy->min_old_gen_size(); |
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81 size_t og_max_size = _collector_policy->max_old_gen_size(); |
0 | 82 // Why isn't there a min_perm_gen_size()? |
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83 size_t pg_min_size = _collector_policy->perm_gen_size(); |
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84 size_t pg_max_size = _collector_policy->max_perm_gen_size(); |
0 | 85 |
86 trace_gen_sizes("ps heap raw", | |
87 pg_min_size, pg_max_size, | |
88 og_min_size, og_max_size, | |
89 yg_min_size, yg_max_size); | |
90 | |
91 // The ReservedSpace ctor used below requires that the page size for the perm | |
92 // gen is <= the page size for the rest of the heap (young + old gens). | |
93 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
94 yg_max_size + og_max_size, | |
95 8); | |
96 const size_t pg_page_sz = MIN2(os::page_size_for_region(pg_min_size, | |
97 pg_max_size, 16), | |
98 og_page_sz); | |
99 | |
100 const size_t pg_align = set_alignment(_perm_gen_alignment, pg_page_sz); | |
101 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
102 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
103 | |
104 // Update sizes to reflect the selected page size(s). | |
105 // | |
106 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
107 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
108 // move to the common code. | |
109 yg_min_size = align_size_up(yg_min_size, yg_align); | |
110 yg_max_size = align_size_up(yg_max_size, yg_align); | |
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111 size_t yg_cur_size = |
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112 align_size_up(_collector_policy->young_gen_size(), yg_align); |
0 | 113 yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
114 | |
115 og_min_size = align_size_up(og_min_size, og_align); | |
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116 // Align old gen size down to preserve specified heap size. |
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117 assert(og_align == yg_align, "sanity"); |
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118 og_max_size = align_size_down(og_max_size, og_align); |
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119 og_max_size = MAX2(og_max_size, og_min_size); |
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120 size_t og_cur_size = |
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121 align_size_down(_collector_policy->old_gen_size(), og_align); |
0 | 122 og_cur_size = MAX2(og_cur_size, og_min_size); |
123 | |
124 pg_min_size = align_size_up(pg_min_size, pg_align); | |
125 pg_max_size = align_size_up(pg_max_size, pg_align); | |
126 size_t pg_cur_size = pg_min_size; | |
127 | |
128 trace_gen_sizes("ps heap rnd", | |
129 pg_min_size, pg_max_size, | |
130 og_min_size, og_max_size, | |
131 yg_min_size, yg_max_size); | |
132 | |
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133 const size_t total_reserved = pg_max_size + og_max_size + yg_max_size; |
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134 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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135 |
0 | 136 // The main part of the heap (old gen + young gen) can often use a larger page |
137 // size than is needed or wanted for the perm gen. Use the "compound | |
138 // alignment" ReservedSpace ctor to avoid having to use the same page size for | |
139 // all gens. | |
642
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140 |
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141 ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size, |
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142 og_align, addr); |
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143 |
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144 if (UseCompressedOops) { |
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145 if (addr != NULL && !heap_rs.is_reserved()) { |
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146 // Failed to reserve at specified address - the requested memory |
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147 // region is taken already, for example, by 'java' launcher. |
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148 // Try again to reserver heap higher. |
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149 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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150 ReservedHeapSpace heap_rs0(pg_max_size, pg_align, og_max_size + yg_max_size, |
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151 og_align, addr); |
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152 if (addr != NULL && !heap_rs0.is_reserved()) { |
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153 // Failed to reserve at specified address again - give up. |
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154 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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155 assert(addr == NULL, ""); |
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156 ReservedHeapSpace heap_rs1(pg_max_size, pg_align, og_max_size + yg_max_size, |
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157 og_align, addr); |
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158 heap_rs = heap_rs1; |
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159 } else { |
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160 heap_rs = heap_rs0; |
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161 } |
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162 } |
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163 } |
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164 |
6197 | 165 MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtJavaHeap); |
166 | |
0 | 167 os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz, |
168 heap_rs.base(), pg_max_size); | |
169 os::trace_page_sizes("ps main", og_min_size + yg_min_size, | |
170 og_max_size + yg_max_size, og_page_sz, | |
171 heap_rs.base() + pg_max_size, | |
172 heap_rs.size() - pg_max_size); | |
173 if (!heap_rs.is_reserved()) { | |
174 vm_shutdown_during_initialization( | |
175 "Could not reserve enough space for object heap"); | |
176 return JNI_ENOMEM; | |
177 } | |
178 | |
179 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
180 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
181 | |
182 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
183 _barrier_set = barrier_set; | |
184 oopDesc::set_bs(_barrier_set); | |
185 if (_barrier_set == NULL) { | |
186 vm_shutdown_during_initialization( | |
187 "Could not reserve enough space for barrier set"); | |
188 return JNI_ENOMEM; | |
189 } | |
190 | |
191 // Initial young gen size is 4 Mb | |
192 // | |
193 // XXX - what about flag_parser.young_gen_size()? | |
194 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
195 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
196 | |
197 // Split the reserved space into perm gen and the main heap (everything else). | |
198 // The main heap uses a different alignment. | |
199 ReservedSpace perm_rs = heap_rs.first_part(pg_max_size); | |
200 ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align); | |
201 | |
202 // Make up the generations | |
203 // Calculate the maximum size that a generation can grow. This | |
204 // includes growth into the other generation. Note that the | |
205 // parameter _max_gen_size is kept as the maximum | |
206 // size of the generation as the boundaries currently stand. | |
207 // _max_gen_size is still used as that value. | |
208 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
209 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
210 | |
211 _gens = new AdjoiningGenerations(main_rs, | |
212 og_cur_size, | |
213 og_min_size, | |
214 og_max_size, | |
215 yg_cur_size, | |
216 yg_min_size, | |
217 yg_max_size, | |
218 yg_align); | |
219 | |
220 _old_gen = _gens->old_gen(); | |
221 _young_gen = _gens->young_gen(); | |
222 | |
223 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
224 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
225 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
226 _size_policy = | |
227 new PSAdaptiveSizePolicy(eden_capacity, | |
228 initial_promo_size, | |
229 young_gen()->to_space()->capacity_in_bytes(), | |
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230 intra_heap_alignment(), |
0 | 231 max_gc_pause_sec, |
232 max_gc_minor_pause_sec, | |
233 GCTimeRatio | |
234 ); | |
235 | |
236 _perm_gen = new PSPermGen(perm_rs, | |
237 pg_align, | |
238 pg_cur_size, | |
239 pg_cur_size, | |
240 pg_max_size, | |
241 "perm", 2); | |
242 | |
243 assert(!UseAdaptiveGCBoundary || | |
244 (old_gen()->virtual_space()->high_boundary() == | |
245 young_gen()->virtual_space()->low_boundary()), | |
246 "Boundaries must meet"); | |
247 // initialize the policy counters - 2 collectors, 3 generations | |
248 _gc_policy_counters = | |
249 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
250 _psh = this; | |
251 | |
252 // Set up the GCTaskManager | |
253 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
254 | |
255 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
256 return JNI_ENOMEM; | |
257 } | |
258 | |
259 return JNI_OK; | |
260 } | |
261 | |
262 void ParallelScavengeHeap::post_initialize() { | |
263 // Need to init the tenuring threshold | |
264 PSScavenge::initialize(); | |
265 if (UseParallelOldGC) { | |
266 PSParallelCompact::post_initialize(); | |
267 } else { | |
268 PSMarkSweep::initialize(); | |
269 } | |
270 PSPromotionManager::initialize(); | |
271 } | |
272 | |
273 void ParallelScavengeHeap::update_counters() { | |
274 young_gen()->update_counters(); | |
275 old_gen()->update_counters(); | |
276 perm_gen()->update_counters(); | |
277 } | |
278 | |
279 size_t ParallelScavengeHeap::capacity() const { | |
280 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
281 return value; | |
282 } | |
283 | |
284 size_t ParallelScavengeHeap::used() const { | |
285 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
286 return value; | |
287 } | |
288 | |
289 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
290 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
291 } | |
292 | |
293 | |
294 size_t ParallelScavengeHeap::permanent_capacity() const { | |
295 return perm_gen()->capacity_in_bytes(); | |
296 } | |
297 | |
298 size_t ParallelScavengeHeap::permanent_used() const { | |
299 return perm_gen()->used_in_bytes(); | |
300 } | |
301 | |
302 size_t ParallelScavengeHeap::max_capacity() const { | |
303 size_t estimated = reserved_region().byte_size(); | |
304 estimated -= perm_gen()->reserved().byte_size(); | |
305 if (UseAdaptiveSizePolicy) { | |
306 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
307 } else { | |
308 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
309 } | |
310 return MAX2(estimated, capacity()); | |
311 } | |
312 | |
313 bool ParallelScavengeHeap::is_in(const void* p) const { | |
314 if (young_gen()->is_in(p)) { | |
315 return true; | |
316 } | |
317 | |
318 if (old_gen()->is_in(p)) { | |
319 return true; | |
320 } | |
321 | |
322 if (perm_gen()->is_in(p)) { | |
323 return true; | |
324 } | |
325 | |
326 return false; | |
327 } | |
328 | |
329 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
330 if (young_gen()->is_in_reserved(p)) { | |
331 return true; | |
332 } | |
333 | |
334 if (old_gen()->is_in_reserved(p)) { | |
335 return true; | |
336 } | |
337 | |
338 if (perm_gen()->is_in_reserved(p)) { | |
339 return true; | |
340 } | |
341 | |
342 return false; | |
343 } | |
344 | |
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345 bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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346 return is_in_young((oop)addr); |
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347 } |
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348 |
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349 #ifdef ASSERT |
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350 // Don't implement this by using is_in_young(). This method is used |
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351 // in some cases to check that is_in_young() is correct. |
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352 bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
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353 assert(is_in_reserved(p) || p == NULL, |
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354 "Does not work if address is non-null and outside of the heap"); |
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355 // The order of the generations is perm (low addr), old, young (high addr) |
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356 return p >= old_gen()->reserved().end(); |
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357 } |
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358 #endif |
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359 |
0 | 360 // There are two levels of allocation policy here. |
361 // | |
362 // When an allocation request fails, the requesting thread must invoke a VM | |
363 // operation, transfer control to the VM thread, and await the results of a | |
364 // garbage collection. That is quite expensive, and we should avoid doing it | |
365 // multiple times if possible. | |
366 // | |
367 // To accomplish this, we have a basic allocation policy, and also a | |
368 // failed allocation policy. | |
369 // | |
370 // The basic allocation policy controls how you allocate memory without | |
371 // attempting garbage collection. It is okay to grab locks and | |
372 // expand the heap, if that can be done without coming to a safepoint. | |
373 // It is likely that the basic allocation policy will not be very | |
374 // aggressive. | |
375 // | |
376 // The failed allocation policy is invoked from the VM thread after | |
377 // the basic allocation policy is unable to satisfy a mem_allocate | |
378 // request. This policy needs to cover the entire range of collection, | |
379 // heap expansion, and out-of-memory conditions. It should make every | |
380 // attempt to allocate the requested memory. | |
381 | |
382 // Basic allocation policy. Should never be called at a safepoint, or | |
383 // from the VM thread. | |
384 // | |
385 // This method must handle cases where many mem_allocate requests fail | |
386 // simultaneously. When that happens, only one VM operation will succeed, | |
387 // and the rest will not be executed. For that reason, this method loops | |
388 // during failed allocation attempts. If the java heap becomes exhausted, | |
389 // we rely on the size_policy object to force a bail out. | |
390 HeapWord* ParallelScavengeHeap::mem_allocate( | |
391 size_t size, | |
392 bool* gc_overhead_limit_was_exceeded) { | |
393 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
394 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
395 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
396 | |
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397 // In general gc_overhead_limit_was_exceeded should be false so |
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398 // set it so here and reset it to true only if the gc time |
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399 // limit is being exceeded as checked below. |
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400 *gc_overhead_limit_was_exceeded = false; |
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401 |
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402 HeapWord* result = young_gen()->allocate(size); |
0 | 403 |
404 uint loop_count = 0; | |
405 uint gc_count = 0; | |
406 | |
407 while (result == NULL) { | |
408 // We don't want to have multiple collections for a single filled generation. | |
409 // To prevent this, each thread tracks the total_collections() value, and if | |
410 // the count has changed, does not do a new collection. | |
411 // | |
412 // The collection count must be read only while holding the heap lock. VM | |
413 // operations also hold the heap lock during collections. There is a lock | |
414 // contention case where thread A blocks waiting on the Heap_lock, while | |
415 // thread B is holding it doing a collection. When thread A gets the lock, | |
416 // the collection count has already changed. To prevent duplicate collections, | |
417 // The policy MUST attempt allocations during the same period it reads the | |
418 // total_collections() value! | |
419 { | |
420 MutexLocker ml(Heap_lock); | |
421 gc_count = Universe::heap()->total_collections(); | |
422 | |
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423 result = young_gen()->allocate(size); |
0 | 424 if (result != NULL) { |
425 return result; | |
426 } | |
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427 |
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428 // If certain conditions hold, try allocating from the old gen. |
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429 result = mem_allocate_old_gen(size); |
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430 if (result != NULL) { |
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431 return result; |
0 | 432 } |
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433 |
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434 // Failed to allocate without a gc. |
0 | 435 if (GC_locker::is_active_and_needs_gc()) { |
436 // If this thread is not in a jni critical section, we stall | |
437 // the requestor until the critical section has cleared and | |
438 // GC allowed. When the critical section clears, a GC is | |
439 // initiated by the last thread exiting the critical section; so | |
440 // we retry the allocation sequence from the beginning of the loop, | |
441 // rather than causing more, now probably unnecessary, GC attempts. | |
442 JavaThread* jthr = JavaThread::current(); | |
443 if (!jthr->in_critical()) { | |
444 MutexUnlocker mul(Heap_lock); | |
445 GC_locker::stall_until_clear(); | |
446 continue; | |
447 } else { | |
448 if (CheckJNICalls) { | |
449 fatal("Possible deadlock due to allocating while" | |
450 " in jni critical section"); | |
451 } | |
452 return NULL; | |
453 } | |
454 } | |
455 } | |
456 | |
457 if (result == NULL) { | |
458 // Generate a VM operation | |
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459 VM_ParallelGCFailedAllocation op(size, gc_count); |
0 | 460 VMThread::execute(&op); |
461 | |
462 // Did the VM operation execute? If so, return the result directly. | |
463 // This prevents us from looping until time out on requests that can | |
464 // not be satisfied. | |
465 if (op.prologue_succeeded()) { | |
466 assert(Universe::heap()->is_in_or_null(op.result()), | |
467 "result not in heap"); | |
468 | |
469 // If GC was locked out during VM operation then retry allocation | |
470 // and/or stall as necessary. | |
471 if (op.gc_locked()) { | |
472 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
473 continue; // retry and/or stall as necessary | |
474 } | |
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475 |
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476 // Exit the loop if the gc time limit has been exceeded. |
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477 // The allocation must have failed above ("result" guarding |
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478 // this path is NULL) and the most recent collection has exceeded the |
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479 // gc overhead limit (although enough may have been collected to |
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480 // satisfy the allocation). Exit the loop so that an out-of-memory |
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481 // will be thrown (return a NULL ignoring the contents of |
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482 // op.result()), |
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483 // but clear gc_overhead_limit_exceeded so that the next collection |
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484 // starts with a clean slate (i.e., forgets about previous overhead |
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485 // excesses). Fill op.result() with a filler object so that the |
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486 // heap remains parsable. |
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487 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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488 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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489 assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
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490 if (limit_exceeded && softrefs_clear) { |
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491 *gc_overhead_limit_was_exceeded = true; |
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492 size_policy()->set_gc_overhead_limit_exceeded(false); |
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493 if (PrintGCDetails && Verbose) { |
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494 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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495 "return NULL because gc_overhead_limit_exceeded is set"); |
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496 } |
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497 if (op.result() != NULL) { |
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498 CollectedHeap::fill_with_object(op.result(), size); |
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499 } |
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500 return NULL; |
0 | 501 } |
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502 |
0 | 503 return op.result(); |
504 } | |
505 } | |
506 | |
507 // The policy object will prevent us from looping forever. If the | |
508 // time spent in gc crosses a threshold, we will bail out. | |
509 loop_count++; | |
510 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
511 (loop_count % QueuedAllocationWarningCount == 0)) { | |
512 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
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513 " size=%d", loop_count, size); |
0 | 514 } |
515 } | |
516 | |
517 return result; | |
518 } | |
519 | |
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520 // A "death march" is a series of ultra-slow allocations in which a full gc is |
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521 // done before each allocation, and after the full gc the allocation still |
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522 // cannot be satisfied from the young gen. This routine detects that condition; |
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523 // it should be called after a full gc has been done and the allocation |
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524 // attempted from the young gen. The parameter 'addr' should be the result of |
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525 // that young gen allocation attempt. |
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526 void |
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527 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
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528 if (addr != NULL) { |
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529 _death_march_count = 0; // death march has ended |
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530 } else if (_death_march_count == 0) { |
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531 if (should_alloc_in_eden(size)) { |
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532 _death_march_count = 1; // death march has started |
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533 } |
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534 } |
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535 } |
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536 |
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537 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
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538 if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
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539 // Size is too big for eden, or gc is locked out. |
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540 return old_gen()->allocate(size); |
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541 } |
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542 |
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543 // If a "death march" is in progress, allocate from the old gen a limited |
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544 // number of times before doing a GC. |
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545 if (_death_march_count > 0) { |
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546 if (_death_march_count < 64) { |
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547 ++_death_march_count; |
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548 return old_gen()->allocate(size); |
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549 } else { |
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550 _death_march_count = 0; |
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551 } |
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552 } |
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553 return NULL; |
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554 } |
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555 |
0 | 556 // Failed allocation policy. Must be called from the VM thread, and |
557 // only at a safepoint! Note that this method has policy for allocation | |
558 // flow, and NOT collection policy. So we do not check for gc collection | |
559 // time over limit here, that is the responsibility of the heap specific | |
560 // collection methods. This method decides where to attempt allocations, | |
561 // and when to attempt collections, but no collection specific policy. | |
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562 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
0 | 563 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
564 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
565 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
566 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
567 | |
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568 // We assume that allocation in eden will fail unless we collect. |
0 | 569 |
570 // First level allocation failure, scavenge and allocate in young gen. | |
571 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
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572 const bool invoked_full_gc = PSScavenge::invoke(); |
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573 HeapWord* result = young_gen()->allocate(size); |
0 | 574 |
575 // Second level allocation failure. | |
576 // Mark sweep and allocate in young generation. | |
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577 if (result == NULL && !invoked_full_gc) { |
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578 invoke_full_gc(false); |
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579 result = young_gen()->allocate(size); |
0 | 580 } |
581 | |
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582 death_march_check(result, size); |
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583 |
0 | 584 // Third level allocation failure. |
585 // After mark sweep and young generation allocation failure, | |
586 // allocate in old generation. | |
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587 if (result == NULL) { |
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588 result = old_gen()->allocate(size); |
0 | 589 } |
590 | |
591 // Fourth level allocation failure. We're running out of memory. | |
592 // More complete mark sweep and allocate in young generation. | |
593 if (result == NULL) { | |
594 invoke_full_gc(true); | |
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595 result = young_gen()->allocate(size); |
0 | 596 } |
597 | |
598 // Fifth level allocation failure. | |
599 // After more complete mark sweep, allocate in old generation. | |
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600 if (result == NULL) { |
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601 result = old_gen()->allocate(size); |
0 | 602 } |
603 | |
604 return result; | |
605 } | |
606 | |
607 // | |
608 // This is the policy loop for allocating in the permanent generation. | |
609 // If the initial allocation fails, we create a vm operation which will | |
610 // cause a collection. | |
611 HeapWord* ParallelScavengeHeap::permanent_mem_allocate(size_t size) { | |
612 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
613 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
614 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
615 | |
616 HeapWord* result; | |
617 | |
618 uint loop_count = 0; | |
619 uint gc_count = 0; | |
620 uint full_gc_count = 0; | |
621 | |
622 do { | |
623 // We don't want to have multiple collections for a single filled generation. | |
624 // To prevent this, each thread tracks the total_collections() value, and if | |
625 // the count has changed, does not do a new collection. | |
626 // | |
627 // The collection count must be read only while holding the heap lock. VM | |
628 // operations also hold the heap lock during collections. There is a lock | |
629 // contention case where thread A blocks waiting on the Heap_lock, while | |
630 // thread B is holding it doing a collection. When thread A gets the lock, | |
631 // the collection count has already changed. To prevent duplicate collections, | |
632 // The policy MUST attempt allocations during the same period it reads the | |
633 // total_collections() value! | |
634 { | |
635 MutexLocker ml(Heap_lock); | |
636 gc_count = Universe::heap()->total_collections(); | |
637 full_gc_count = Universe::heap()->total_full_collections(); | |
638 | |
639 result = perm_gen()->allocate_permanent(size); | |
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640 |
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641 if (result != NULL) { |
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642 return result; |
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643 } |
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644 |
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645 if (GC_locker::is_active_and_needs_gc()) { |
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646 // If this thread is not in a jni critical section, we stall |
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647 // the requestor until the critical section has cleared and |
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648 // GC allowed. When the critical section clears, a GC is |
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649 // initiated by the last thread exiting the critical section; so |
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650 // we retry the allocation sequence from the beginning of the loop, |
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651 // rather than causing more, now probably unnecessary, GC attempts. |
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652 JavaThread* jthr = JavaThread::current(); |
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653 if (!jthr->in_critical()) { |
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654 MutexUnlocker mul(Heap_lock); |
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655 GC_locker::stall_until_clear(); |
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656 continue; |
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657 } else { |
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658 if (CheckJNICalls) { |
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659 fatal("Possible deadlock due to allocating while" |
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660 " in jni critical section"); |
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661 } |
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662 return NULL; |
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663 } |
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664 } |
0 | 665 } |
666 | |
667 if (result == NULL) { | |
668 | |
669 // Exit the loop if the gc time limit has been exceeded. | |
670 // The allocation must have failed above (result must be NULL), | |
671 // and the most recent collection must have exceeded the | |
672 // gc time limit. Exit the loop so that an out-of-memory | |
673 // will be thrown (returning a NULL will do that), but | |
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674 // clear gc_overhead_limit_exceeded so that the next collection |
0 | 675 // will succeeded if the applications decides to handle the |
676 // out-of-memory and tries to go on. | |
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677 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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678 if (limit_exceeded) { |
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679 size_policy()->set_gc_overhead_limit_exceeded(false); |
0 | 680 if (PrintGCDetails && Verbose) { |
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681 gclog_or_tty->print_cr("ParallelScavengeHeap::permanent_mem_allocate:" |
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682 " return NULL because gc_overhead_limit_exceeded is set"); |
0 | 683 } |
684 assert(result == NULL, "Allocation did not fail"); | |
685 return NULL; | |
686 } | |
687 | |
688 // Generate a VM operation | |
689 VM_ParallelGCFailedPermanentAllocation op(size, gc_count, full_gc_count); | |
690 VMThread::execute(&op); | |
691 | |
692 // Did the VM operation execute? If so, return the result directly. | |
693 // This prevents us from looping until time out on requests that can | |
694 // not be satisfied. | |
695 if (op.prologue_succeeded()) { | |
696 assert(Universe::heap()->is_in_permanent_or_null(op.result()), | |
697 "result not in heap"); | |
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698 // If GC was locked out during VM operation then retry allocation |
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699 // and/or stall as necessary. |
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700 if (op.gc_locked()) { |
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701 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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702 continue; // retry and/or stall as necessary |
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703 } |
0 | 704 // If a NULL results is being returned, an out-of-memory |
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705 // will be thrown now. Clear the gc_overhead_limit_exceeded |
0 | 706 // flag to avoid the following situation. |
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707 // gc_overhead_limit_exceeded is set during a collection |
0 | 708 // the collection fails to return enough space and an OOM is thrown |
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709 // a subsequent GC prematurely throws an out-of-memory because |
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710 // the gc_overhead_limit_exceeded counts did not start |
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711 // again from 0. |
0 | 712 if (op.result() == NULL) { |
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713 size_policy()->reset_gc_overhead_limit_count(); |
0 | 714 } |
715 return op.result(); | |
716 } | |
717 } | |
718 | |
719 // The policy object will prevent us from looping forever. If the | |
720 // time spent in gc crosses a threshold, we will bail out. | |
721 loop_count++; | |
722 if ((QueuedAllocationWarningCount > 0) && | |
723 (loop_count % QueuedAllocationWarningCount == 0)) { | |
724 warning("ParallelScavengeHeap::permanent_mem_allocate retries %d times \n\t" | |
725 " size=%d", loop_count, size); | |
726 } | |
727 } while (result == NULL); | |
728 | |
729 return result; | |
730 } | |
731 | |
732 // | |
733 // This is the policy code for permanent allocations which have failed | |
734 // and require a collection. Note that just as in failed_mem_allocate, | |
735 // we do not set collection policy, only where & when to allocate and | |
736 // collect. | |
737 HeapWord* ParallelScavengeHeap::failed_permanent_mem_allocate(size_t size) { | |
738 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
739 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
740 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
741 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
742 assert(size > perm_gen()->free_in_words(), "Allocation should fail"); | |
743 | |
744 // We assume (and assert!) that an allocation at this point will fail | |
745 // unless we collect. | |
746 | |
747 // First level allocation failure. Mark-sweep and allocate in perm gen. | |
748 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
749 invoke_full_gc(false); | |
750 HeapWord* result = perm_gen()->allocate_permanent(size); | |
751 | |
752 // Second level allocation failure. We're running out of memory. | |
753 if (result == NULL) { | |
754 invoke_full_gc(true); | |
755 result = perm_gen()->allocate_permanent(size); | |
756 } | |
757 | |
758 return result; | |
759 } | |
760 | |
761 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
762 CollectedHeap::ensure_parsability(retire_tlabs); | |
763 young_gen()->eden_space()->ensure_parsability(); | |
764 } | |
765 | |
766 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
767 return young_gen()->eden_space()->free_in_bytes(); | |
768 } | |
769 | |
770 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
771 return young_gen()->eden_space()->tlab_capacity(thr); | |
772 } | |
773 | |
774 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
775 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
776 } | |
777 | |
778 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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779 return young_gen()->allocate(size); |
0 | 780 } |
781 | |
782 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
783 CollectedHeap::accumulate_statistics_all_tlabs(); | |
784 } | |
785 | |
786 void ParallelScavengeHeap::resize_all_tlabs() { | |
787 CollectedHeap::resize_all_tlabs(); | |
788 } | |
789 | |
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790 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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791 // We don't need barriers for stores to objects in the |
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792 // young gen and, a fortiori, for initializing stores to |
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793 // objects therein. |
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794 return is_in_young(new_obj); |
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795 } |
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796 |
0 | 797 // This method is used by System.gc() and JVMTI. |
798 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
799 assert(!Heap_lock->owned_by_self(), | |
800 "this thread should not own the Heap_lock"); | |
801 | |
802 unsigned int gc_count = 0; | |
803 unsigned int full_gc_count = 0; | |
804 { | |
805 MutexLocker ml(Heap_lock); | |
806 // This value is guarded by the Heap_lock | |
807 gc_count = Universe::heap()->total_collections(); | |
808 full_gc_count = Universe::heap()->total_full_collections(); | |
809 } | |
810 | |
811 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
812 VMThread::execute(&op); | |
813 } | |
814 | |
815 // This interface assumes that it's being called by the | |
816 // vm thread. It collects the heap assuming that the | |
817 // heap lock is already held and that we are executing in | |
818 // the context of the vm thread. | |
819 void ParallelScavengeHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
820 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
821 assert(Heap_lock->is_locked(), "Precondition#2"); | |
822 GCCauseSetter gcs(this, cause); | |
823 switch (cause) { | |
824 case GCCause::_heap_inspection: | |
825 case GCCause::_heap_dump: { | |
826 HandleMark hm; | |
827 invoke_full_gc(false); | |
828 break; | |
829 } | |
830 default: // XXX FIX ME | |
831 ShouldNotReachHere(); | |
832 } | |
833 } | |
834 | |
835 | |
836 void ParallelScavengeHeap::oop_iterate(OopClosure* cl) { | |
837 Unimplemented(); | |
838 } | |
839 | |
840 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
841 young_gen()->object_iterate(cl); | |
842 old_gen()->object_iterate(cl); | |
843 perm_gen()->object_iterate(cl); | |
844 } | |
845 | |
846 void ParallelScavengeHeap::permanent_oop_iterate(OopClosure* cl) { | |
847 Unimplemented(); | |
848 } | |
849 | |
850 void ParallelScavengeHeap::permanent_object_iterate(ObjectClosure* cl) { | |
851 perm_gen()->object_iterate(cl); | |
852 } | |
853 | |
854 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
855 if (young_gen()->is_in_reserved(addr)) { | |
856 assert(young_gen()->is_in(addr), | |
857 "addr should be in allocated part of young gen"); | |
1907 | 858 // called from os::print_location by find or VMError |
859 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
0 | 860 Unimplemented(); |
861 } else if (old_gen()->is_in_reserved(addr)) { | |
862 assert(old_gen()->is_in(addr), | |
863 "addr should be in allocated part of old gen"); | |
864 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
865 } else if (perm_gen()->is_in_reserved(addr)) { | |
866 assert(perm_gen()->is_in(addr), | |
867 "addr should be in allocated part of perm gen"); | |
868 return perm_gen()->start_array()->object_start((HeapWord*)addr); | |
869 } | |
870 return 0; | |
871 } | |
872 | |
873 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
874 return oop(addr)->size(); | |
875 } | |
876 | |
877 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
878 return block_start(addr) == addr; | |
879 } | |
880 | |
881 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
882 return UseParallelOldGC ? | |
883 PSParallelCompact::millis_since_last_gc() : | |
884 PSMarkSweep::millis_since_last_gc(); | |
885 } | |
886 | |
887 void ParallelScavengeHeap::prepare_for_verify() { | |
888 ensure_parsability(false); // no need to retire TLABs for verification | |
889 } | |
890 | |
891 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
892 young_gen()->print_on(st); | |
893 old_gen()->print_on(st); | |
894 perm_gen()->print_on(st); | |
895 } | |
896 | |
897 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { | |
898 PSScavenge::gc_task_manager()->threads_do(tc); | |
899 } | |
900 | |
901 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
902 PSScavenge::gc_task_manager()->print_threads_on(st); | |
903 } | |
904 | |
905 void ParallelScavengeHeap::print_tracing_info() const { | |
906 if (TraceGen0Time) { | |
907 double time = PSScavenge::accumulated_time()->seconds(); | |
908 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
909 } | |
910 if (TraceGen1Time) { | |
911 double time = PSMarkSweep::accumulated_time()->seconds(); | |
912 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); | |
913 } | |
914 } | |
915 | |
916 | |
6008 | 917 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
0 | 918 // Why do we need the total_collections()-filter below? |
919 if (total_collections() > 0) { | |
920 if (!silent) { | |
921 gclog_or_tty->print("permanent "); | |
922 } | |
6008 | 923 perm_gen()->verify(); |
0 | 924 |
925 if (!silent) { | |
926 gclog_or_tty->print("tenured "); | |
927 } | |
6008 | 928 old_gen()->verify(); |
0 | 929 |
930 if (!silent) { | |
931 gclog_or_tty->print("eden "); | |
932 } | |
6008 | 933 young_gen()->verify(); |
0 | 934 } |
935 } | |
936 | |
937 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
938 if (PrintGCDetails && Verbose) { | |
939 gclog_or_tty->print(" " SIZE_FORMAT | |
940 "->" SIZE_FORMAT | |
941 "(" SIZE_FORMAT ")", | |
942 prev_used, used(), capacity()); | |
943 } else { | |
944 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
945 "->" SIZE_FORMAT "K" | |
946 "(" SIZE_FORMAT "K)", | |
947 prev_used / K, used() / K, capacity() / K); | |
948 } | |
949 } | |
950 | |
951 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
952 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
953 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
954 return _psh; | |
955 } | |
956 | |
957 // Before delegating the resize to the young generation, | |
958 // the reserved space for the young and old generations | |
959 // may be changed to accomodate the desired resize. | |
960 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
961 size_t survivor_size) { | |
962 if (UseAdaptiveGCBoundary) { | |
963 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
964 size_policy()->reset_bytes_absorbed_from_eden(); | |
965 return; // The generation changed size already. | |
966 } | |
967 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
968 } | |
969 | |
970 // Delegate the resize to the generation. | |
971 _young_gen->resize(eden_size, survivor_size); | |
972 } | |
973 | |
974 // Before delegating the resize to the old generation, | |
975 // the reserved space for the young and old generations | |
976 // may be changed to accomodate the desired resize. | |
977 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
978 if (UseAdaptiveGCBoundary) { | |
979 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
980 size_policy()->reset_bytes_absorbed_from_eden(); | |
981 return; // The generation changed size already. | |
982 } | |
983 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
984 } | |
985 | |
986 // Delegate the resize to the generation. | |
987 _old_gen->resize(desired_free_space); | |
988 } | |
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989 |
989
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990 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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991 // nothing particular |
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992 } |
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993 |
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994 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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995 // nothing particular |
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996 } |
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997 |
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998 #ifndef PRODUCT |
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999 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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1000 if (ZapUnusedHeapArea) { |
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1001 young_gen()->record_spaces_top(); |
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1002 old_gen()->record_spaces_top(); |
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1003 perm_gen()->record_spaces_top(); |
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1004 } |
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1005 } |
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1006 |
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1007 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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1008 if (ZapUnusedHeapArea) { |
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1009 young_gen()->eden_space()->mangle_unused_area(); |
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1010 young_gen()->to_space()->mangle_unused_area(); |
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1011 young_gen()->from_space()->mangle_unused_area(); |
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1012 old_gen()->object_space()->mangle_unused_area(); |
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1013 perm_gen()->object_space()->mangle_unused_area(); |
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1014 } |
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1015 } |
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1016 #endif |