Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 2370:048f98400b8e
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author | jcoomes |
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date | Fri, 18 Mar 2011 09:03:43 -0700 |
parents | 336d17dff7cc |
children | 2aa9ddbb9e60 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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" | |
43 #include "utilities/vmError.hpp" | |
0 | 44 |
45 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
46 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
47 PSPermGen* ParallelScavengeHeap::_perm_gen = NULL; | |
48 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
49 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
50 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
51 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
52 | |
53 static void trace_gen_sizes(const char* const str, | |
54 size_t pg_min, size_t pg_max, | |
55 size_t og_min, size_t og_max, | |
56 size_t yg_min, size_t yg_max) | |
57 { | |
58 if (TracePageSizes) { | |
59 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
60 SIZE_FORMAT "," SIZE_FORMAT " " | |
61 SIZE_FORMAT "," SIZE_FORMAT " " | |
62 SIZE_FORMAT, | |
63 str, pg_min / K, pg_max / K, | |
64 og_min / K, og_max / K, | |
65 yg_min / K, yg_max / K, | |
66 (pg_max + og_max + yg_max) / K); | |
67 } | |
68 } | |
69 | |
70 jint ParallelScavengeHeap::initialize() { | |
1166 | 71 CollectedHeap::pre_initialize(); |
72 | |
0 | 73 // Cannot be initialized until after the flags are parsed |
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74 // GenerationSizer flag_parser; |
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75 _collector_policy = new GenerationSizer(); |
0 | 76 |
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77 size_t yg_min_size = _collector_policy->min_young_gen_size(); |
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78 size_t yg_max_size = _collector_policy->max_young_gen_size(); |
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79 size_t og_min_size = _collector_policy->min_old_gen_size(); |
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80 size_t og_max_size = _collector_policy->max_old_gen_size(); |
0 | 81 // Why isn't there a min_perm_gen_size()? |
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82 size_t pg_min_size = _collector_policy->perm_gen_size(); |
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83 size_t pg_max_size = _collector_policy->max_perm_gen_size(); |
0 | 84 |
85 trace_gen_sizes("ps heap raw", | |
86 pg_min_size, pg_max_size, | |
87 og_min_size, og_max_size, | |
88 yg_min_size, yg_max_size); | |
89 | |
90 // The ReservedSpace ctor used below requires that the page size for the perm | |
91 // gen is <= the page size for the rest of the heap (young + old gens). | |
92 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
93 yg_max_size + og_max_size, | |
94 8); | |
95 const size_t pg_page_sz = MIN2(os::page_size_for_region(pg_min_size, | |
96 pg_max_size, 16), | |
97 og_page_sz); | |
98 | |
99 const size_t pg_align = set_alignment(_perm_gen_alignment, pg_page_sz); | |
100 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
101 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
102 | |
103 // Update sizes to reflect the selected page size(s). | |
104 // | |
105 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
106 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
107 // move to the common code. | |
108 yg_min_size = align_size_up(yg_min_size, yg_align); | |
109 yg_max_size = align_size_up(yg_max_size, yg_align); | |
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110 size_t yg_cur_size = |
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111 align_size_up(_collector_policy->young_gen_size(), yg_align); |
0 | 112 yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
113 | |
114 og_min_size = align_size_up(og_min_size, og_align); | |
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115 // Align old gen size down to preserve specified heap size. |
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116 assert(og_align == yg_align, "sanity"); |
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117 og_max_size = align_size_down(og_max_size, og_align); |
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118 og_max_size = MAX2(og_max_size, og_min_size); |
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119 size_t og_cur_size = |
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120 align_size_down(_collector_policy->old_gen_size(), og_align); |
0 | 121 og_cur_size = MAX2(og_cur_size, og_min_size); |
122 | |
123 pg_min_size = align_size_up(pg_min_size, pg_align); | |
124 pg_max_size = align_size_up(pg_max_size, pg_align); | |
125 size_t pg_cur_size = pg_min_size; | |
126 | |
127 trace_gen_sizes("ps heap rnd", | |
128 pg_min_size, pg_max_size, | |
129 og_min_size, og_max_size, | |
130 yg_min_size, yg_max_size); | |
131 | |
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132 const size_t total_reserved = pg_max_size + og_max_size + yg_max_size; |
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133 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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134 |
0 | 135 // The main part of the heap (old gen + young gen) can often use a larger page |
136 // size than is needed or wanted for the perm gen. Use the "compound | |
137 // alignment" ReservedSpace ctor to avoid having to use the same page size for | |
138 // all gens. | |
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139 |
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140 ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size, |
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141 og_align, addr); |
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142 |
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143 if (UseCompressedOops) { |
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144 if (addr != NULL && !heap_rs.is_reserved()) { |
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145 // Failed to reserve at specified address - the requested memory |
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146 // region is taken already, for example, by 'java' launcher. |
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147 // Try again to reserver heap higher. |
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148 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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149 ReservedHeapSpace heap_rs0(pg_max_size, pg_align, og_max_size + yg_max_size, |
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150 og_align, addr); |
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151 if (addr != NULL && !heap_rs0.is_reserved()) { |
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152 // Failed to reserve at specified address again - give up. |
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153 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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154 assert(addr == NULL, ""); |
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155 ReservedHeapSpace heap_rs1(pg_max_size, pg_align, og_max_size + yg_max_size, |
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156 og_align, addr); |
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157 heap_rs = heap_rs1; |
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158 } else { |
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159 heap_rs = heap_rs0; |
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160 } |
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161 } |
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162 } |
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163 |
0 | 164 os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz, |
165 heap_rs.base(), pg_max_size); | |
166 os::trace_page_sizes("ps main", og_min_size + yg_min_size, | |
167 og_max_size + yg_max_size, og_page_sz, | |
168 heap_rs.base() + pg_max_size, | |
169 heap_rs.size() - pg_max_size); | |
170 if (!heap_rs.is_reserved()) { | |
171 vm_shutdown_during_initialization( | |
172 "Could not reserve enough space for object heap"); | |
173 return JNI_ENOMEM; | |
174 } | |
175 | |
176 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
177 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
178 | |
179 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
180 _barrier_set = barrier_set; | |
181 oopDesc::set_bs(_barrier_set); | |
182 if (_barrier_set == NULL) { | |
183 vm_shutdown_during_initialization( | |
184 "Could not reserve enough space for barrier set"); | |
185 return JNI_ENOMEM; | |
186 } | |
187 | |
188 // Initial young gen size is 4 Mb | |
189 // | |
190 // XXX - what about flag_parser.young_gen_size()? | |
191 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
192 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
193 | |
194 // Split the reserved space into perm gen and the main heap (everything else). | |
195 // The main heap uses a different alignment. | |
196 ReservedSpace perm_rs = heap_rs.first_part(pg_max_size); | |
197 ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align); | |
198 | |
199 // Make up the generations | |
200 // Calculate the maximum size that a generation can grow. This | |
201 // includes growth into the other generation. Note that the | |
202 // parameter _max_gen_size is kept as the maximum | |
203 // size of the generation as the boundaries currently stand. | |
204 // _max_gen_size is still used as that value. | |
205 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
206 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
207 | |
208 _gens = new AdjoiningGenerations(main_rs, | |
209 og_cur_size, | |
210 og_min_size, | |
211 og_max_size, | |
212 yg_cur_size, | |
213 yg_min_size, | |
214 yg_max_size, | |
215 yg_align); | |
216 | |
217 _old_gen = _gens->old_gen(); | |
218 _young_gen = _gens->young_gen(); | |
219 | |
220 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
221 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
222 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
223 _size_policy = | |
224 new PSAdaptiveSizePolicy(eden_capacity, | |
225 initial_promo_size, | |
226 young_gen()->to_space()->capacity_in_bytes(), | |
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227 intra_heap_alignment(), |
0 | 228 max_gc_pause_sec, |
229 max_gc_minor_pause_sec, | |
230 GCTimeRatio | |
231 ); | |
232 | |
233 _perm_gen = new PSPermGen(perm_rs, | |
234 pg_align, | |
235 pg_cur_size, | |
236 pg_cur_size, | |
237 pg_max_size, | |
238 "perm", 2); | |
239 | |
240 assert(!UseAdaptiveGCBoundary || | |
241 (old_gen()->virtual_space()->high_boundary() == | |
242 young_gen()->virtual_space()->low_boundary()), | |
243 "Boundaries must meet"); | |
244 // initialize the policy counters - 2 collectors, 3 generations | |
245 _gc_policy_counters = | |
246 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
247 _psh = this; | |
248 | |
249 // Set up the GCTaskManager | |
250 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
251 | |
252 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
253 return JNI_ENOMEM; | |
254 } | |
255 | |
256 return JNI_OK; | |
257 } | |
258 | |
259 void ParallelScavengeHeap::post_initialize() { | |
260 // Need to init the tenuring threshold | |
261 PSScavenge::initialize(); | |
262 if (UseParallelOldGC) { | |
263 PSParallelCompact::post_initialize(); | |
264 } else { | |
265 PSMarkSweep::initialize(); | |
266 } | |
267 PSPromotionManager::initialize(); | |
268 } | |
269 | |
270 void ParallelScavengeHeap::update_counters() { | |
271 young_gen()->update_counters(); | |
272 old_gen()->update_counters(); | |
273 perm_gen()->update_counters(); | |
274 } | |
275 | |
276 size_t ParallelScavengeHeap::capacity() const { | |
277 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
278 return value; | |
279 } | |
280 | |
281 size_t ParallelScavengeHeap::used() const { | |
282 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
283 return value; | |
284 } | |
285 | |
286 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
287 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
288 } | |
289 | |
290 | |
291 size_t ParallelScavengeHeap::permanent_capacity() const { | |
292 return perm_gen()->capacity_in_bytes(); | |
293 } | |
294 | |
295 size_t ParallelScavengeHeap::permanent_used() const { | |
296 return perm_gen()->used_in_bytes(); | |
297 } | |
298 | |
299 size_t ParallelScavengeHeap::max_capacity() const { | |
300 size_t estimated = reserved_region().byte_size(); | |
301 estimated -= perm_gen()->reserved().byte_size(); | |
302 if (UseAdaptiveSizePolicy) { | |
303 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
304 } else { | |
305 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
306 } | |
307 return MAX2(estimated, capacity()); | |
308 } | |
309 | |
310 bool ParallelScavengeHeap::is_in(const void* p) const { | |
311 if (young_gen()->is_in(p)) { | |
312 return true; | |
313 } | |
314 | |
315 if (old_gen()->is_in(p)) { | |
316 return true; | |
317 } | |
318 | |
319 if (perm_gen()->is_in(p)) { | |
320 return true; | |
321 } | |
322 | |
323 return false; | |
324 } | |
325 | |
326 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
327 if (young_gen()->is_in_reserved(p)) { | |
328 return true; | |
329 } | |
330 | |
331 if (old_gen()->is_in_reserved(p)) { | |
332 return true; | |
333 } | |
334 | |
335 if (perm_gen()->is_in_reserved(p)) { | |
336 return true; | |
337 } | |
338 | |
339 return false; | |
340 } | |
341 | |
342 // There are two levels of allocation policy here. | |
343 // | |
344 // When an allocation request fails, the requesting thread must invoke a VM | |
345 // operation, transfer control to the VM thread, and await the results of a | |
346 // garbage collection. That is quite expensive, and we should avoid doing it | |
347 // multiple times if possible. | |
348 // | |
349 // To accomplish this, we have a basic allocation policy, and also a | |
350 // failed allocation policy. | |
351 // | |
352 // The basic allocation policy controls how you allocate memory without | |
353 // attempting garbage collection. It is okay to grab locks and | |
354 // expand the heap, if that can be done without coming to a safepoint. | |
355 // It is likely that the basic allocation policy will not be very | |
356 // aggressive. | |
357 // | |
358 // The failed allocation policy is invoked from the VM thread after | |
359 // the basic allocation policy is unable to satisfy a mem_allocate | |
360 // request. This policy needs to cover the entire range of collection, | |
361 // heap expansion, and out-of-memory conditions. It should make every | |
362 // attempt to allocate the requested memory. | |
363 | |
364 // Basic allocation policy. Should never be called at a safepoint, or | |
365 // from the VM thread. | |
366 // | |
367 // This method must handle cases where many mem_allocate requests fail | |
368 // simultaneously. When that happens, only one VM operation will succeed, | |
369 // and the rest will not be executed. For that reason, this method loops | |
370 // during failed allocation attempts. If the java heap becomes exhausted, | |
371 // we rely on the size_policy object to force a bail out. | |
372 HeapWord* ParallelScavengeHeap::mem_allocate( | |
373 size_t size, | |
374 bool is_noref, | |
375 bool is_tlab, | |
376 bool* gc_overhead_limit_was_exceeded) { | |
377 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
378 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
379 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
380 | |
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381 // In general gc_overhead_limit_was_exceeded should be false so |
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382 // set it so here and reset it to true only if the gc time |
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383 // limit is being exceeded as checked below. |
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384 *gc_overhead_limit_was_exceeded = false; |
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385 |
0 | 386 HeapWord* result = young_gen()->allocate(size, is_tlab); |
387 | |
388 uint loop_count = 0; | |
389 uint gc_count = 0; | |
390 | |
391 while (result == NULL) { | |
392 // We don't want to have multiple collections for a single filled generation. | |
393 // To prevent this, each thread tracks the total_collections() value, and if | |
394 // the count has changed, does not do a new collection. | |
395 // | |
396 // The collection count must be read only while holding the heap lock. VM | |
397 // operations also hold the heap lock during collections. There is a lock | |
398 // contention case where thread A blocks waiting on the Heap_lock, while | |
399 // thread B is holding it doing a collection. When thread A gets the lock, | |
400 // the collection count has already changed. To prevent duplicate collections, | |
401 // The policy MUST attempt allocations during the same period it reads the | |
402 // total_collections() value! | |
403 { | |
404 MutexLocker ml(Heap_lock); | |
405 gc_count = Universe::heap()->total_collections(); | |
406 | |
407 result = young_gen()->allocate(size, is_tlab); | |
408 | |
409 // (1) If the requested object is too large to easily fit in the | |
410 // young_gen, or | |
411 // (2) If GC is locked out via GCLocker, young gen is full and | |
412 // the need for a GC already signalled to GCLocker (done | |
413 // at a safepoint), | |
414 // ... then, rather than force a safepoint and (a potentially futile) | |
415 // collection (attempt) for each allocation, try allocation directly | |
416 // in old_gen. For case (2) above, we may in the future allow | |
417 // TLAB allocation directly in the old gen. | |
418 if (result != NULL) { | |
419 return result; | |
420 } | |
421 if (!is_tlab && | |
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422 size >= (young_gen()->eden_space()->capacity_in_words(Thread::current()) / 2)) { |
0 | 423 result = old_gen()->allocate(size, is_tlab); |
424 if (result != NULL) { | |
425 return result; | |
426 } | |
427 } | |
428 if (GC_locker::is_active_and_needs_gc()) { | |
429 // GC is locked out. If this is a TLAB allocation, | |
430 // return NULL; the requestor will retry allocation | |
431 // of an idividual object at a time. | |
432 if (is_tlab) { | |
433 return NULL; | |
434 } | |
435 | |
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 | |
459 // Generate a VM operation | |
460 VM_ParallelGCFailedAllocation op(size, is_tlab, gc_count); | |
461 VMThread::execute(&op); | |
462 | |
463 // Did the VM operation execute? If so, return the result directly. | |
464 // This prevents us from looping until time out on requests that can | |
465 // not be satisfied. | |
466 if (op.prologue_succeeded()) { | |
467 assert(Universe::heap()->is_in_or_null(op.result()), | |
468 "result not in heap"); | |
469 | |
470 // If GC was locked out during VM operation then retry allocation | |
471 // and/or stall as necessary. | |
472 if (op.gc_locked()) { | |
473 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
474 continue; // retry and/or stall as necessary | |
475 } | |
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476 |
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477 // Exit the loop if the gc time limit has been exceeded. |
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478 // The allocation must have failed above ("result" guarding |
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479 // this path is NULL) and the most recent collection has exceeded the |
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480 // gc overhead limit (although enough may have been collected to |
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481 // satisfy the allocation). Exit the loop so that an out-of-memory |
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482 // will be thrown (return a NULL ignoring the contents of |
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483 // op.result()), |
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484 // but clear gc_overhead_limit_exceeded so that the next collection |
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485 // starts with a clean slate (i.e., forgets about previous overhead |
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486 // excesses). Fill op.result() with a filler object so that the |
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487 // heap remains parsable. |
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488 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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489 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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490 assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
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491 if (limit_exceeded && softrefs_clear) { |
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492 *gc_overhead_limit_was_exceeded = true; |
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493 size_policy()->set_gc_overhead_limit_exceeded(false); |
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494 if (PrintGCDetails && Verbose) { |
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495 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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496 "return NULL because gc_overhead_limit_exceeded is set"); |
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497 } |
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498 if (op.result() != NULL) { |
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499 CollectedHeap::fill_with_object(op.result(), size); |
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500 } |
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501 return NULL; |
0 | 502 } |
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503 |
0 | 504 return op.result(); |
505 } | |
506 } | |
507 | |
508 // The policy object will prevent us from looping forever. If the | |
509 // time spent in gc crosses a threshold, we will bail out. | |
510 loop_count++; | |
511 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
512 (loop_count % QueuedAllocationWarningCount == 0)) { | |
513 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
514 " size=%d %s", loop_count, size, is_tlab ? "(TLAB)" : ""); | |
515 } | |
516 } | |
517 | |
518 return result; | |
519 } | |
520 | |
521 // Failed allocation policy. Must be called from the VM thread, and | |
522 // only at a safepoint! Note that this method has policy for allocation | |
523 // flow, and NOT collection policy. So we do not check for gc collection | |
524 // time over limit here, that is the responsibility of the heap specific | |
525 // collection methods. This method decides where to attempt allocations, | |
526 // and when to attempt collections, but no collection specific policy. | |
527 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size, bool is_tlab) { | |
528 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
529 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
530 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
531 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
532 | |
533 size_t mark_sweep_invocation_count = total_invocations(); | |
534 | |
535 // We assume (and assert!) that an allocation at this point will fail | |
536 // unless we collect. | |
537 | |
538 // First level allocation failure, scavenge and allocate in young gen. | |
539 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
540 PSScavenge::invoke(); | |
541 HeapWord* result = young_gen()->allocate(size, is_tlab); | |
542 | |
543 // Second level allocation failure. | |
544 // Mark sweep and allocate in young generation. | |
545 if (result == NULL) { | |
546 // There is some chance the scavenge method decided to invoke mark_sweep. | |
547 // Don't mark sweep twice if so. | |
548 if (mark_sweep_invocation_count == total_invocations()) { | |
549 invoke_full_gc(false); | |
550 result = young_gen()->allocate(size, is_tlab); | |
551 } | |
552 } | |
553 | |
554 // Third level allocation failure. | |
555 // After mark sweep and young generation allocation failure, | |
556 // allocate in old generation. | |
557 if (result == NULL && !is_tlab) { | |
558 result = old_gen()->allocate(size, is_tlab); | |
559 } | |
560 | |
561 // Fourth level allocation failure. We're running out of memory. | |
562 // More complete mark sweep and allocate in young generation. | |
563 if (result == NULL) { | |
564 invoke_full_gc(true); | |
565 result = young_gen()->allocate(size, is_tlab); | |
566 } | |
567 | |
568 // Fifth level allocation failure. | |
569 // After more complete mark sweep, allocate in old generation. | |
570 if (result == NULL && !is_tlab) { | |
571 result = old_gen()->allocate(size, is_tlab); | |
572 } | |
573 | |
574 return result; | |
575 } | |
576 | |
577 // | |
578 // This is the policy loop for allocating in the permanent generation. | |
579 // If the initial allocation fails, we create a vm operation which will | |
580 // cause a collection. | |
581 HeapWord* ParallelScavengeHeap::permanent_mem_allocate(size_t size) { | |
582 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
583 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
584 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
585 | |
586 HeapWord* result; | |
587 | |
588 uint loop_count = 0; | |
589 uint gc_count = 0; | |
590 uint full_gc_count = 0; | |
591 | |
592 do { | |
593 // We don't want to have multiple collections for a single filled generation. | |
594 // To prevent this, each thread tracks the total_collections() value, and if | |
595 // the count has changed, does not do a new collection. | |
596 // | |
597 // The collection count must be read only while holding the heap lock. VM | |
598 // operations also hold the heap lock during collections. There is a lock | |
599 // contention case where thread A blocks waiting on the Heap_lock, while | |
600 // thread B is holding it doing a collection. When thread A gets the lock, | |
601 // the collection count has already changed. To prevent duplicate collections, | |
602 // The policy MUST attempt allocations during the same period it reads the | |
603 // total_collections() value! | |
604 { | |
605 MutexLocker ml(Heap_lock); | |
606 gc_count = Universe::heap()->total_collections(); | |
607 full_gc_count = Universe::heap()->total_full_collections(); | |
608 | |
609 result = perm_gen()->allocate_permanent(size); | |
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610 |
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611 if (result != NULL) { |
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612 return result; |
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613 } |
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614 |
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615 if (GC_locker::is_active_and_needs_gc()) { |
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616 // If this thread is not in a jni critical section, we stall |
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617 // the requestor until the critical section has cleared and |
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618 // GC allowed. When the critical section clears, a GC is |
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619 // initiated by the last thread exiting the critical section; so |
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620 // we retry the allocation sequence from the beginning of the loop, |
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621 // rather than causing more, now probably unnecessary, GC attempts. |
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622 JavaThread* jthr = JavaThread::current(); |
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623 if (!jthr->in_critical()) { |
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624 MutexUnlocker mul(Heap_lock); |
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625 GC_locker::stall_until_clear(); |
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626 continue; |
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627 } else { |
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628 if (CheckJNICalls) { |
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629 fatal("Possible deadlock due to allocating while" |
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630 " in jni critical section"); |
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631 } |
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632 return NULL; |
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633 } |
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634 } |
0 | 635 } |
636 | |
637 if (result == NULL) { | |
638 | |
639 // Exit the loop if the gc time limit has been exceeded. | |
640 // The allocation must have failed above (result must be NULL), | |
641 // and the most recent collection must have exceeded the | |
642 // gc time limit. Exit the loop so that an out-of-memory | |
643 // will be thrown (returning a NULL will do that), but | |
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644 // clear gc_overhead_limit_exceeded so that the next collection |
0 | 645 // will succeeded if the applications decides to handle the |
646 // out-of-memory and tries to go on. | |
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647 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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648 if (limit_exceeded) { |
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649 size_policy()->set_gc_overhead_limit_exceeded(false); |
0 | 650 if (PrintGCDetails && Verbose) { |
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651 gclog_or_tty->print_cr("ParallelScavengeHeap::permanent_mem_allocate:" |
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652 " return NULL because gc_overhead_limit_exceeded is set"); |
0 | 653 } |
654 assert(result == NULL, "Allocation did not fail"); | |
655 return NULL; | |
656 } | |
657 | |
658 // Generate a VM operation | |
659 VM_ParallelGCFailedPermanentAllocation op(size, gc_count, full_gc_count); | |
660 VMThread::execute(&op); | |
661 | |
662 // Did the VM operation execute? If so, return the result directly. | |
663 // This prevents us from looping until time out on requests that can | |
664 // not be satisfied. | |
665 if (op.prologue_succeeded()) { | |
666 assert(Universe::heap()->is_in_permanent_or_null(op.result()), | |
667 "result not in heap"); | |
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668 // If GC was locked out during VM operation then retry allocation |
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669 // and/or stall as necessary. |
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670 if (op.gc_locked()) { |
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671 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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672 continue; // retry and/or stall as necessary |
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673 } |
0 | 674 // If a NULL results is being returned, an out-of-memory |
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675 // will be thrown now. Clear the gc_overhead_limit_exceeded |
0 | 676 // flag to avoid the following situation. |
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677 // gc_overhead_limit_exceeded is set during a collection |
0 | 678 // the collection fails to return enough space and an OOM is thrown |
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679 // a subsequent GC prematurely throws an out-of-memory because |
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680 // the gc_overhead_limit_exceeded counts did not start |
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681 // again from 0. |
0 | 682 if (op.result() == NULL) { |
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683 size_policy()->reset_gc_overhead_limit_count(); |
0 | 684 } |
685 return op.result(); | |
686 } | |
687 } | |
688 | |
689 // The policy object will prevent us from looping forever. If the | |
690 // time spent in gc crosses a threshold, we will bail out. | |
691 loop_count++; | |
692 if ((QueuedAllocationWarningCount > 0) && | |
693 (loop_count % QueuedAllocationWarningCount == 0)) { | |
694 warning("ParallelScavengeHeap::permanent_mem_allocate retries %d times \n\t" | |
695 " size=%d", loop_count, size); | |
696 } | |
697 } while (result == NULL); | |
698 | |
699 return result; | |
700 } | |
701 | |
702 // | |
703 // This is the policy code for permanent allocations which have failed | |
704 // and require a collection. Note that just as in failed_mem_allocate, | |
705 // we do not set collection policy, only where & when to allocate and | |
706 // collect. | |
707 HeapWord* ParallelScavengeHeap::failed_permanent_mem_allocate(size_t size) { | |
708 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
709 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
710 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
711 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
712 assert(size > perm_gen()->free_in_words(), "Allocation should fail"); | |
713 | |
714 // We assume (and assert!) that an allocation at this point will fail | |
715 // unless we collect. | |
716 | |
717 // First level allocation failure. Mark-sweep and allocate in perm gen. | |
718 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
719 invoke_full_gc(false); | |
720 HeapWord* result = perm_gen()->allocate_permanent(size); | |
721 | |
722 // Second level allocation failure. We're running out of memory. | |
723 if (result == NULL) { | |
724 invoke_full_gc(true); | |
725 result = perm_gen()->allocate_permanent(size); | |
726 } | |
727 | |
728 return result; | |
729 } | |
730 | |
731 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
732 CollectedHeap::ensure_parsability(retire_tlabs); | |
733 young_gen()->eden_space()->ensure_parsability(); | |
734 } | |
735 | |
736 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
737 return young_gen()->eden_space()->free_in_bytes(); | |
738 } | |
739 | |
740 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
741 return young_gen()->eden_space()->tlab_capacity(thr); | |
742 } | |
743 | |
744 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
745 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
746 } | |
747 | |
748 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
749 return young_gen()->allocate(size, true); | |
750 } | |
751 | |
752 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
753 CollectedHeap::accumulate_statistics_all_tlabs(); | |
754 } | |
755 | |
756 void ParallelScavengeHeap::resize_all_tlabs() { | |
757 CollectedHeap::resize_all_tlabs(); | |
758 } | |
759 | |
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760 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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761 // We don't need barriers for stores to objects in the |
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762 // young gen and, a fortiori, for initializing stores to |
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763 // objects therein. |
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764 return is_in_young(new_obj); |
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765 } |
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766 |
0 | 767 // This method is used by System.gc() and JVMTI. |
768 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
769 assert(!Heap_lock->owned_by_self(), | |
770 "this thread should not own the Heap_lock"); | |
771 | |
772 unsigned int gc_count = 0; | |
773 unsigned int full_gc_count = 0; | |
774 { | |
775 MutexLocker ml(Heap_lock); | |
776 // This value is guarded by the Heap_lock | |
777 gc_count = Universe::heap()->total_collections(); | |
778 full_gc_count = Universe::heap()->total_full_collections(); | |
779 } | |
780 | |
781 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
782 VMThread::execute(&op); | |
783 } | |
784 | |
785 // This interface assumes that it's being called by the | |
786 // vm thread. It collects the heap assuming that the | |
787 // heap lock is already held and that we are executing in | |
788 // the context of the vm thread. | |
789 void ParallelScavengeHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
790 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
791 assert(Heap_lock->is_locked(), "Precondition#2"); | |
792 GCCauseSetter gcs(this, cause); | |
793 switch (cause) { | |
794 case GCCause::_heap_inspection: | |
795 case GCCause::_heap_dump: { | |
796 HandleMark hm; | |
797 invoke_full_gc(false); | |
798 break; | |
799 } | |
800 default: // XXX FIX ME | |
801 ShouldNotReachHere(); | |
802 } | |
803 } | |
804 | |
805 | |
806 void ParallelScavengeHeap::oop_iterate(OopClosure* cl) { | |
807 Unimplemented(); | |
808 } | |
809 | |
810 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
811 young_gen()->object_iterate(cl); | |
812 old_gen()->object_iterate(cl); | |
813 perm_gen()->object_iterate(cl); | |
814 } | |
815 | |
816 void ParallelScavengeHeap::permanent_oop_iterate(OopClosure* cl) { | |
817 Unimplemented(); | |
818 } | |
819 | |
820 void ParallelScavengeHeap::permanent_object_iterate(ObjectClosure* cl) { | |
821 perm_gen()->object_iterate(cl); | |
822 } | |
823 | |
824 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
825 if (young_gen()->is_in_reserved(addr)) { | |
826 assert(young_gen()->is_in(addr), | |
827 "addr should be in allocated part of young gen"); | |
1907 | 828 // called from os::print_location by find or VMError |
829 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
0 | 830 Unimplemented(); |
831 } else if (old_gen()->is_in_reserved(addr)) { | |
832 assert(old_gen()->is_in(addr), | |
833 "addr should be in allocated part of old gen"); | |
834 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
835 } else if (perm_gen()->is_in_reserved(addr)) { | |
836 assert(perm_gen()->is_in(addr), | |
837 "addr should be in allocated part of perm gen"); | |
838 return perm_gen()->start_array()->object_start((HeapWord*)addr); | |
839 } | |
840 return 0; | |
841 } | |
842 | |
843 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
844 return oop(addr)->size(); | |
845 } | |
846 | |
847 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
848 return block_start(addr) == addr; | |
849 } | |
850 | |
851 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
852 return UseParallelOldGC ? | |
853 PSParallelCompact::millis_since_last_gc() : | |
854 PSMarkSweep::millis_since_last_gc(); | |
855 } | |
856 | |
857 void ParallelScavengeHeap::prepare_for_verify() { | |
858 ensure_parsability(false); // no need to retire TLABs for verification | |
859 } | |
860 | |
861 void ParallelScavengeHeap::print() const { print_on(tty); } | |
862 | |
863 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
864 young_gen()->print_on(st); | |
865 old_gen()->print_on(st); | |
866 perm_gen()->print_on(st); | |
867 } | |
868 | |
869 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { | |
870 PSScavenge::gc_task_manager()->threads_do(tc); | |
871 } | |
872 | |
873 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
874 PSScavenge::gc_task_manager()->print_threads_on(st); | |
875 } | |
876 | |
877 void ParallelScavengeHeap::print_tracing_info() const { | |
878 if (TraceGen0Time) { | |
879 double time = PSScavenge::accumulated_time()->seconds(); | |
880 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
881 } | |
882 if (TraceGen1Time) { | |
883 double time = PSMarkSweep::accumulated_time()->seconds(); | |
884 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); | |
885 } | |
886 } | |
887 | |
888 | |
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889 void ParallelScavengeHeap::verify(bool allow_dirty, bool silent, bool option /* ignored */) { |
0 | 890 // Why do we need the total_collections()-filter below? |
891 if (total_collections() > 0) { | |
892 if (!silent) { | |
893 gclog_or_tty->print("permanent "); | |
894 } | |
895 perm_gen()->verify(allow_dirty); | |
896 | |
897 if (!silent) { | |
898 gclog_or_tty->print("tenured "); | |
899 } | |
900 old_gen()->verify(allow_dirty); | |
901 | |
902 if (!silent) { | |
903 gclog_or_tty->print("eden "); | |
904 } | |
905 young_gen()->verify(allow_dirty); | |
906 } | |
907 if (!silent) { | |
908 gclog_or_tty->print("ref_proc "); | |
909 } | |
910 ReferenceProcessor::verify(); | |
911 } | |
912 | |
913 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
914 if (PrintGCDetails && Verbose) { | |
915 gclog_or_tty->print(" " SIZE_FORMAT | |
916 "->" SIZE_FORMAT | |
917 "(" SIZE_FORMAT ")", | |
918 prev_used, used(), capacity()); | |
919 } else { | |
920 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
921 "->" SIZE_FORMAT "K" | |
922 "(" SIZE_FORMAT "K)", | |
923 prev_used / K, used() / K, capacity() / K); | |
924 } | |
925 } | |
926 | |
927 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
928 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
929 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
930 return _psh; | |
931 } | |
932 | |
933 // Before delegating the resize to the young generation, | |
934 // the reserved space for the young and old generations | |
935 // may be changed to accomodate the desired resize. | |
936 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
937 size_t survivor_size) { | |
938 if (UseAdaptiveGCBoundary) { | |
939 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
940 size_policy()->reset_bytes_absorbed_from_eden(); | |
941 return; // The generation changed size already. | |
942 } | |
943 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
944 } | |
945 | |
946 // Delegate the resize to the generation. | |
947 _young_gen->resize(eden_size, survivor_size); | |
948 } | |
949 | |
950 // Before delegating the resize to the old generation, | |
951 // the reserved space for the young and old generations | |
952 // may be changed to accomodate the desired resize. | |
953 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
954 if (UseAdaptiveGCBoundary) { | |
955 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
956 size_policy()->reset_bytes_absorbed_from_eden(); | |
957 return; // The generation changed size already. | |
958 } | |
959 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
960 } | |
961 | |
962 // Delegate the resize to the generation. | |
963 _old_gen->resize(desired_free_space); | |
964 } | |
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965 |
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966 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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967 // nothing particular |
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968 } |
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969 |
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970 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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971 // nothing particular |
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972 } |
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973 |
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974 #ifndef PRODUCT |
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975 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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976 if (ZapUnusedHeapArea) { |
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977 young_gen()->record_spaces_top(); |
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978 old_gen()->record_spaces_top(); |
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979 perm_gen()->record_spaces_top(); |
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980 } |
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981 } |
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982 |
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983 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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984 if (ZapUnusedHeapArea) { |
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985 young_gen()->eden_space()->mangle_unused_area(); |
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986 young_gen()->to_space()->mangle_unused_area(); |
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987 young_gen()->from_space()->mangle_unused_area(); |
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988 old_gen()->object_space()->mangle_unused_area(); |
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989 perm_gen()->object_space()->mangle_unused_area(); |
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990 } |
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991 } |
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992 #endif |