Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 806:821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
Summary: Short-circuit gc-a-lot attempts by non-JavaThreads; SkipGCALot c'tor to elide re-entrant gc-a-lot attempts.
Reviewed-by: apetrusenko, jcoomes, jmasa, kamg
author | ysr |
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date | Thu, 11 Jun 2009 12:40:00 -0700 |
parents | c89f86385056 |
children | df6caf649ff7 |
rev | line source |
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0 | 1 /* |
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2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_parallelScavengeHeap.cpp.incl" | |
27 | |
28 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
29 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
30 PSPermGen* ParallelScavengeHeap::_perm_gen = NULL; | |
31 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
32 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
33 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
34 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
35 | |
36 static void trace_gen_sizes(const char* const str, | |
37 size_t pg_min, size_t pg_max, | |
38 size_t og_min, size_t og_max, | |
39 size_t yg_min, size_t yg_max) | |
40 { | |
41 if (TracePageSizes) { | |
42 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
43 SIZE_FORMAT "," SIZE_FORMAT " " | |
44 SIZE_FORMAT "," SIZE_FORMAT " " | |
45 SIZE_FORMAT, | |
46 str, pg_min / K, pg_max / K, | |
47 og_min / K, og_max / K, | |
48 yg_min / K, yg_max / K, | |
49 (pg_max + og_max + yg_max) / K); | |
50 } | |
51 } | |
52 | |
53 jint ParallelScavengeHeap::initialize() { | |
54 // Cannot be initialized until after the flags are parsed | |
55 GenerationSizer flag_parser; | |
56 | |
57 size_t yg_min_size = flag_parser.min_young_gen_size(); | |
58 size_t yg_max_size = flag_parser.max_young_gen_size(); | |
59 size_t og_min_size = flag_parser.min_old_gen_size(); | |
60 size_t og_max_size = flag_parser.max_old_gen_size(); | |
61 // Why isn't there a min_perm_gen_size()? | |
62 size_t pg_min_size = flag_parser.perm_gen_size(); | |
63 size_t pg_max_size = flag_parser.max_perm_gen_size(); | |
64 | |
65 trace_gen_sizes("ps heap raw", | |
66 pg_min_size, pg_max_size, | |
67 og_min_size, og_max_size, | |
68 yg_min_size, yg_max_size); | |
69 | |
70 // The ReservedSpace ctor used below requires that the page size for the perm | |
71 // gen is <= the page size for the rest of the heap (young + old gens). | |
72 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
73 yg_max_size + og_max_size, | |
74 8); | |
75 const size_t pg_page_sz = MIN2(os::page_size_for_region(pg_min_size, | |
76 pg_max_size, 16), | |
77 og_page_sz); | |
78 | |
79 const size_t pg_align = set_alignment(_perm_gen_alignment, pg_page_sz); | |
80 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
81 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
82 | |
83 // Update sizes to reflect the selected page size(s). | |
84 // | |
85 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
86 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
87 // move to the common code. | |
88 yg_min_size = align_size_up(yg_min_size, yg_align); | |
89 yg_max_size = align_size_up(yg_max_size, yg_align); | |
90 size_t yg_cur_size = align_size_up(flag_parser.young_gen_size(), yg_align); | |
91 yg_cur_size = MAX2(yg_cur_size, yg_min_size); | |
92 | |
93 og_min_size = align_size_up(og_min_size, og_align); | |
94 og_max_size = align_size_up(og_max_size, og_align); | |
95 size_t og_cur_size = align_size_up(flag_parser.old_gen_size(), og_align); | |
96 og_cur_size = MAX2(og_cur_size, og_min_size); | |
97 | |
98 pg_min_size = align_size_up(pg_min_size, pg_align); | |
99 pg_max_size = align_size_up(pg_max_size, pg_align); | |
100 size_t pg_cur_size = pg_min_size; | |
101 | |
102 trace_gen_sizes("ps heap rnd", | |
103 pg_min_size, pg_max_size, | |
104 og_min_size, og_max_size, | |
105 yg_min_size, yg_max_size); | |
106 | |
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107 const size_t total_reserved = pg_max_size + og_max_size + yg_max_size; |
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108 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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109 |
0 | 110 // The main part of the heap (old gen + young gen) can often use a larger page |
111 // size than is needed or wanted for the perm gen. Use the "compound | |
112 // alignment" ReservedSpace ctor to avoid having to use the same page size for | |
113 // all gens. | |
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114 |
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115 ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size, |
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116 og_align, addr); |
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117 |
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118 if (UseCompressedOops) { |
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119 if (addr != NULL && !heap_rs.is_reserved()) { |
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120 // Failed to reserve at specified address - the requested memory |
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121 // region is taken already, for example, by 'java' launcher. |
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122 // Try again to reserver heap higher. |
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123 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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124 ReservedHeapSpace heap_rs0(pg_max_size, pg_align, og_max_size + yg_max_size, |
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125 og_align, addr); |
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126 if (addr != NULL && !heap_rs0.is_reserved()) { |
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127 // Failed to reserve at specified address again - give up. |
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128 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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129 assert(addr == NULL, ""); |
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130 ReservedHeapSpace heap_rs1(pg_max_size, pg_align, og_max_size + yg_max_size, |
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131 og_align, addr); |
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132 heap_rs = heap_rs1; |
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133 } else { |
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134 heap_rs = heap_rs0; |
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135 } |
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136 } |
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137 } |
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138 |
0 | 139 os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz, |
140 heap_rs.base(), pg_max_size); | |
141 os::trace_page_sizes("ps main", og_min_size + yg_min_size, | |
142 og_max_size + yg_max_size, og_page_sz, | |
143 heap_rs.base() + pg_max_size, | |
144 heap_rs.size() - pg_max_size); | |
145 if (!heap_rs.is_reserved()) { | |
146 vm_shutdown_during_initialization( | |
147 "Could not reserve enough space for object heap"); | |
148 return JNI_ENOMEM; | |
149 } | |
150 | |
151 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
152 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
153 | |
154 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
155 _barrier_set = barrier_set; | |
156 oopDesc::set_bs(_barrier_set); | |
157 if (_barrier_set == NULL) { | |
158 vm_shutdown_during_initialization( | |
159 "Could not reserve enough space for barrier set"); | |
160 return JNI_ENOMEM; | |
161 } | |
162 | |
163 // Initial young gen size is 4 Mb | |
164 // | |
165 // XXX - what about flag_parser.young_gen_size()? | |
166 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
167 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
168 | |
169 // Split the reserved space into perm gen and the main heap (everything else). | |
170 // The main heap uses a different alignment. | |
171 ReservedSpace perm_rs = heap_rs.first_part(pg_max_size); | |
172 ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align); | |
173 | |
174 // Make up the generations | |
175 // Calculate the maximum size that a generation can grow. This | |
176 // includes growth into the other generation. Note that the | |
177 // parameter _max_gen_size is kept as the maximum | |
178 // size of the generation as the boundaries currently stand. | |
179 // _max_gen_size is still used as that value. | |
180 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
181 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
182 | |
183 _gens = new AdjoiningGenerations(main_rs, | |
184 og_cur_size, | |
185 og_min_size, | |
186 og_max_size, | |
187 yg_cur_size, | |
188 yg_min_size, | |
189 yg_max_size, | |
190 yg_align); | |
191 | |
192 _old_gen = _gens->old_gen(); | |
193 _young_gen = _gens->young_gen(); | |
194 | |
195 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
196 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
197 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
198 _size_policy = | |
199 new PSAdaptiveSizePolicy(eden_capacity, | |
200 initial_promo_size, | |
201 young_gen()->to_space()->capacity_in_bytes(), | |
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202 intra_heap_alignment(), |
0 | 203 max_gc_pause_sec, |
204 max_gc_minor_pause_sec, | |
205 GCTimeRatio | |
206 ); | |
207 | |
208 _perm_gen = new PSPermGen(perm_rs, | |
209 pg_align, | |
210 pg_cur_size, | |
211 pg_cur_size, | |
212 pg_max_size, | |
213 "perm", 2); | |
214 | |
215 assert(!UseAdaptiveGCBoundary || | |
216 (old_gen()->virtual_space()->high_boundary() == | |
217 young_gen()->virtual_space()->low_boundary()), | |
218 "Boundaries must meet"); | |
219 // initialize the policy counters - 2 collectors, 3 generations | |
220 _gc_policy_counters = | |
221 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
222 _psh = this; | |
223 | |
224 // Set up the GCTaskManager | |
225 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
226 | |
227 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
228 return JNI_ENOMEM; | |
229 } | |
230 | |
231 return JNI_OK; | |
232 } | |
233 | |
234 void ParallelScavengeHeap::post_initialize() { | |
235 // Need to init the tenuring threshold | |
236 PSScavenge::initialize(); | |
237 if (UseParallelOldGC) { | |
238 PSParallelCompact::post_initialize(); | |
239 } else { | |
240 PSMarkSweep::initialize(); | |
241 } | |
242 PSPromotionManager::initialize(); | |
243 } | |
244 | |
245 void ParallelScavengeHeap::update_counters() { | |
246 young_gen()->update_counters(); | |
247 old_gen()->update_counters(); | |
248 perm_gen()->update_counters(); | |
249 } | |
250 | |
251 size_t ParallelScavengeHeap::capacity() const { | |
252 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
253 return value; | |
254 } | |
255 | |
256 size_t ParallelScavengeHeap::used() const { | |
257 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
258 return value; | |
259 } | |
260 | |
261 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
262 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
263 } | |
264 | |
265 | |
266 size_t ParallelScavengeHeap::permanent_capacity() const { | |
267 return perm_gen()->capacity_in_bytes(); | |
268 } | |
269 | |
270 size_t ParallelScavengeHeap::permanent_used() const { | |
271 return perm_gen()->used_in_bytes(); | |
272 } | |
273 | |
274 size_t ParallelScavengeHeap::max_capacity() const { | |
275 size_t estimated = reserved_region().byte_size(); | |
276 estimated -= perm_gen()->reserved().byte_size(); | |
277 if (UseAdaptiveSizePolicy) { | |
278 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
279 } else { | |
280 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
281 } | |
282 return MAX2(estimated, capacity()); | |
283 } | |
284 | |
285 bool ParallelScavengeHeap::is_in(const void* p) const { | |
286 if (young_gen()->is_in(p)) { | |
287 return true; | |
288 } | |
289 | |
290 if (old_gen()->is_in(p)) { | |
291 return true; | |
292 } | |
293 | |
294 if (perm_gen()->is_in(p)) { | |
295 return true; | |
296 } | |
297 | |
298 return false; | |
299 } | |
300 | |
301 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
302 if (young_gen()->is_in_reserved(p)) { | |
303 return true; | |
304 } | |
305 | |
306 if (old_gen()->is_in_reserved(p)) { | |
307 return true; | |
308 } | |
309 | |
310 if (perm_gen()->is_in_reserved(p)) { | |
311 return true; | |
312 } | |
313 | |
314 return false; | |
315 } | |
316 | |
317 // Static method | |
318 bool ParallelScavengeHeap::is_in_young(oop* p) { | |
319 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
320 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, | |
321 "Must be ParallelScavengeHeap"); | |
322 | |
323 PSYoungGen* young_gen = heap->young_gen(); | |
324 | |
325 if (young_gen->is_in_reserved(p)) { | |
326 return true; | |
327 } | |
328 | |
329 return false; | |
330 } | |
331 | |
332 // Static method | |
333 bool ParallelScavengeHeap::is_in_old_or_perm(oop* p) { | |
334 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
335 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, | |
336 "Must be ParallelScavengeHeap"); | |
337 | |
338 PSOldGen* old_gen = heap->old_gen(); | |
339 PSPermGen* perm_gen = heap->perm_gen(); | |
340 | |
341 if (old_gen->is_in_reserved(p)) { | |
342 return true; | |
343 } | |
344 | |
345 if (perm_gen->is_in_reserved(p)) { | |
346 return true; | |
347 } | |
348 | |
349 return false; | |
350 } | |
351 | |
352 // There are two levels of allocation policy here. | |
353 // | |
354 // When an allocation request fails, the requesting thread must invoke a VM | |
355 // operation, transfer control to the VM thread, and await the results of a | |
356 // garbage collection. That is quite expensive, and we should avoid doing it | |
357 // multiple times if possible. | |
358 // | |
359 // To accomplish this, we have a basic allocation policy, and also a | |
360 // failed allocation policy. | |
361 // | |
362 // The basic allocation policy controls how you allocate memory without | |
363 // attempting garbage collection. It is okay to grab locks and | |
364 // expand the heap, if that can be done without coming to a safepoint. | |
365 // It is likely that the basic allocation policy will not be very | |
366 // aggressive. | |
367 // | |
368 // The failed allocation policy is invoked from the VM thread after | |
369 // the basic allocation policy is unable to satisfy a mem_allocate | |
370 // request. This policy needs to cover the entire range of collection, | |
371 // heap expansion, and out-of-memory conditions. It should make every | |
372 // attempt to allocate the requested memory. | |
373 | |
374 // Basic allocation policy. Should never be called at a safepoint, or | |
375 // from the VM thread. | |
376 // | |
377 // This method must handle cases where many mem_allocate requests fail | |
378 // simultaneously. When that happens, only one VM operation will succeed, | |
379 // and the rest will not be executed. For that reason, this method loops | |
380 // during failed allocation attempts. If the java heap becomes exhausted, | |
381 // we rely on the size_policy object to force a bail out. | |
382 HeapWord* ParallelScavengeHeap::mem_allocate( | |
383 size_t size, | |
384 bool is_noref, | |
385 bool is_tlab, | |
386 bool* gc_overhead_limit_was_exceeded) { | |
387 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
388 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
389 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
390 | |
391 HeapWord* result = young_gen()->allocate(size, is_tlab); | |
392 | |
393 uint loop_count = 0; | |
394 uint gc_count = 0; | |
395 | |
396 while (result == NULL) { | |
397 // We don't want to have multiple collections for a single filled generation. | |
398 // To prevent this, each thread tracks the total_collections() value, and if | |
399 // the count has changed, does not do a new collection. | |
400 // | |
401 // The collection count must be read only while holding the heap lock. VM | |
402 // operations also hold the heap lock during collections. There is a lock | |
403 // contention case where thread A blocks waiting on the Heap_lock, while | |
404 // thread B is holding it doing a collection. When thread A gets the lock, | |
405 // the collection count has already changed. To prevent duplicate collections, | |
406 // The policy MUST attempt allocations during the same period it reads the | |
407 // total_collections() value! | |
408 { | |
409 MutexLocker ml(Heap_lock); | |
410 gc_count = Universe::heap()->total_collections(); | |
411 | |
412 result = young_gen()->allocate(size, is_tlab); | |
413 | |
414 // (1) If the requested object is too large to easily fit in the | |
415 // young_gen, or | |
416 // (2) If GC is locked out via GCLocker, young gen is full and | |
417 // the need for a GC already signalled to GCLocker (done | |
418 // at a safepoint), | |
419 // ... then, rather than force a safepoint and (a potentially futile) | |
420 // collection (attempt) for each allocation, try allocation directly | |
421 // in old_gen. For case (2) above, we may in the future allow | |
422 // TLAB allocation directly in the old gen. | |
423 if (result != NULL) { | |
424 return result; | |
425 } | |
426 if (!is_tlab && | |
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427 size >= (young_gen()->eden_space()->capacity_in_words(Thread::current()) / 2)) { |
0 | 428 result = old_gen()->allocate(size, is_tlab); |
429 if (result != NULL) { | |
430 return result; | |
431 } | |
432 } | |
433 if (GC_locker::is_active_and_needs_gc()) { | |
434 // GC is locked out. If this is a TLAB allocation, | |
435 // return NULL; the requestor will retry allocation | |
436 // of an idividual object at a time. | |
437 if (is_tlab) { | |
438 return NULL; | |
439 } | |
440 | |
441 // If this thread is not in a jni critical section, we stall | |
442 // the requestor until the critical section has cleared and | |
443 // GC allowed. When the critical section clears, a GC is | |
444 // initiated by the last thread exiting the critical section; so | |
445 // we retry the allocation sequence from the beginning of the loop, | |
446 // rather than causing more, now probably unnecessary, GC attempts. | |
447 JavaThread* jthr = JavaThread::current(); | |
448 if (!jthr->in_critical()) { | |
449 MutexUnlocker mul(Heap_lock); | |
450 GC_locker::stall_until_clear(); | |
451 continue; | |
452 } else { | |
453 if (CheckJNICalls) { | |
454 fatal("Possible deadlock due to allocating while" | |
455 " in jni critical section"); | |
456 } | |
457 return NULL; | |
458 } | |
459 } | |
460 } | |
461 | |
462 if (result == NULL) { | |
463 | |
464 // Exit the loop if if the gc time limit has been exceeded. | |
465 // The allocation must have failed above (result must be NULL), | |
466 // and the most recent collection must have exceeded the | |
467 // gc time limit. Exit the loop so that an out-of-memory | |
468 // will be thrown (returning a NULL will do that), but | |
469 // clear gc_time_limit_exceeded so that the next collection | |
470 // will succeeded if the applications decides to handle the | |
471 // out-of-memory and tries to go on. | |
472 *gc_overhead_limit_was_exceeded = size_policy()->gc_time_limit_exceeded(); | |
473 if (size_policy()->gc_time_limit_exceeded()) { | |
474 size_policy()->set_gc_time_limit_exceeded(false); | |
475 if (PrintGCDetails && Verbose) { | |
476 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " | |
477 "return NULL because gc_time_limit_exceeded is set"); | |
478 } | |
479 return NULL; | |
480 } | |
481 | |
482 // Generate a VM operation | |
483 VM_ParallelGCFailedAllocation op(size, is_tlab, gc_count); | |
484 VMThread::execute(&op); | |
485 | |
486 // Did the VM operation execute? If so, return the result directly. | |
487 // This prevents us from looping until time out on requests that can | |
488 // not be satisfied. | |
489 if (op.prologue_succeeded()) { | |
490 assert(Universe::heap()->is_in_or_null(op.result()), | |
491 "result not in heap"); | |
492 | |
493 // If GC was locked out during VM operation then retry allocation | |
494 // and/or stall as necessary. | |
495 if (op.gc_locked()) { | |
496 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
497 continue; // retry and/or stall as necessary | |
498 } | |
499 // If a NULL result is being returned, an out-of-memory | |
500 // will be thrown now. Clear the gc_time_limit_exceeded | |
501 // flag to avoid the following situation. | |
502 // gc_time_limit_exceeded is set during a collection | |
503 // the collection fails to return enough space and an OOM is thrown | |
504 // the next GC is skipped because the gc_time_limit_exceeded | |
505 // flag is set and another OOM is thrown | |
506 if (op.result() == NULL) { | |
507 size_policy()->set_gc_time_limit_exceeded(false); | |
508 } | |
509 return op.result(); | |
510 } | |
511 } | |
512 | |
513 // The policy object will prevent us from looping forever. If the | |
514 // time spent in gc crosses a threshold, we will bail out. | |
515 loop_count++; | |
516 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
517 (loop_count % QueuedAllocationWarningCount == 0)) { | |
518 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
519 " size=%d %s", loop_count, size, is_tlab ? "(TLAB)" : ""); | |
520 } | |
521 } | |
522 | |
523 return result; | |
524 } | |
525 | |
526 // Failed allocation policy. Must be called from the VM thread, and | |
527 // only at a safepoint! Note that this method has policy for allocation | |
528 // flow, and NOT collection policy. So we do not check for gc collection | |
529 // time over limit here, that is the responsibility of the heap specific | |
530 // collection methods. This method decides where to attempt allocations, | |
531 // and when to attempt collections, but no collection specific policy. | |
532 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size, bool is_tlab) { | |
533 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
534 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
535 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
536 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
537 | |
538 size_t mark_sweep_invocation_count = total_invocations(); | |
539 | |
540 // We assume (and assert!) that an allocation at this point will fail | |
541 // unless we collect. | |
542 | |
543 // First level allocation failure, scavenge and allocate in young gen. | |
544 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
545 PSScavenge::invoke(); | |
546 HeapWord* result = young_gen()->allocate(size, is_tlab); | |
547 | |
548 // Second level allocation failure. | |
549 // Mark sweep and allocate in young generation. | |
550 if (result == NULL) { | |
551 // There is some chance the scavenge method decided to invoke mark_sweep. | |
552 // Don't mark sweep twice if so. | |
553 if (mark_sweep_invocation_count == total_invocations()) { | |
554 invoke_full_gc(false); | |
555 result = young_gen()->allocate(size, is_tlab); | |
556 } | |
557 } | |
558 | |
559 // Third level allocation failure. | |
560 // After mark sweep and young generation allocation failure, | |
561 // allocate in old generation. | |
562 if (result == NULL && !is_tlab) { | |
563 result = old_gen()->allocate(size, is_tlab); | |
564 } | |
565 | |
566 // Fourth level allocation failure. We're running out of memory. | |
567 // More complete mark sweep and allocate in young generation. | |
568 if (result == NULL) { | |
569 invoke_full_gc(true); | |
570 result = young_gen()->allocate(size, is_tlab); | |
571 } | |
572 | |
573 // Fifth level allocation failure. | |
574 // After more complete mark sweep, allocate in old generation. | |
575 if (result == NULL && !is_tlab) { | |
576 result = old_gen()->allocate(size, is_tlab); | |
577 } | |
578 | |
579 return result; | |
580 } | |
581 | |
582 // | |
583 // This is the policy loop for allocating in the permanent generation. | |
584 // If the initial allocation fails, we create a vm operation which will | |
585 // cause a collection. | |
586 HeapWord* ParallelScavengeHeap::permanent_mem_allocate(size_t size) { | |
587 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
588 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
589 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
590 | |
591 HeapWord* result; | |
592 | |
593 uint loop_count = 0; | |
594 uint gc_count = 0; | |
595 uint full_gc_count = 0; | |
596 | |
597 do { | |
598 // We don't want to have multiple collections for a single filled generation. | |
599 // To prevent this, each thread tracks the total_collections() value, and if | |
600 // the count has changed, does not do a new collection. | |
601 // | |
602 // The collection count must be read only while holding the heap lock. VM | |
603 // operations also hold the heap lock during collections. There is a lock | |
604 // contention case where thread A blocks waiting on the Heap_lock, while | |
605 // thread B is holding it doing a collection. When thread A gets the lock, | |
606 // the collection count has already changed. To prevent duplicate collections, | |
607 // The policy MUST attempt allocations during the same period it reads the | |
608 // total_collections() value! | |
609 { | |
610 MutexLocker ml(Heap_lock); | |
611 gc_count = Universe::heap()->total_collections(); | |
612 full_gc_count = Universe::heap()->total_full_collections(); | |
613 | |
614 result = perm_gen()->allocate_permanent(size); | |
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615 |
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616 if (result != NULL) { |
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617 return result; |
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618 } |
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619 |
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620 if (GC_locker::is_active_and_needs_gc()) { |
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621 // If this thread is not in a jni critical section, we stall |
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622 // the requestor until the critical section has cleared and |
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623 // GC allowed. When the critical section clears, a GC is |
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624 // initiated by the last thread exiting the critical section; so |
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625 // we retry the allocation sequence from the beginning of the loop, |
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626 // rather than causing more, now probably unnecessary, GC attempts. |
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627 JavaThread* jthr = JavaThread::current(); |
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628 if (!jthr->in_critical()) { |
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629 MutexUnlocker mul(Heap_lock); |
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630 GC_locker::stall_until_clear(); |
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631 continue; |
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632 } else { |
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633 if (CheckJNICalls) { |
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634 fatal("Possible deadlock due to allocating while" |
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635 " in jni critical section"); |
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636 } |
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637 return NULL; |
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638 } |
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639 } |
0 | 640 } |
641 | |
642 if (result == NULL) { | |
643 | |
644 // Exit the loop if the gc time limit has been exceeded. | |
645 // The allocation must have failed above (result must be NULL), | |
646 // and the most recent collection must have exceeded the | |
647 // gc time limit. Exit the loop so that an out-of-memory | |
648 // will be thrown (returning a NULL will do that), but | |
649 // clear gc_time_limit_exceeded so that the next collection | |
650 // will succeeded if the applications decides to handle the | |
651 // out-of-memory and tries to go on. | |
652 if (size_policy()->gc_time_limit_exceeded()) { | |
653 size_policy()->set_gc_time_limit_exceeded(false); | |
654 if (PrintGCDetails && Verbose) { | |
655 gclog_or_tty->print_cr("ParallelScavengeHeap::permanent_mem_allocate: " | |
656 "return NULL because gc_time_limit_exceeded is set"); | |
657 } | |
658 assert(result == NULL, "Allocation did not fail"); | |
659 return NULL; | |
660 } | |
661 | |
662 // Generate a VM operation | |
663 VM_ParallelGCFailedPermanentAllocation op(size, gc_count, full_gc_count); | |
664 VMThread::execute(&op); | |
665 | |
666 // Did the VM operation execute? If so, return the result directly. | |
667 // This prevents us from looping until time out on requests that can | |
668 // not be satisfied. | |
669 if (op.prologue_succeeded()) { | |
670 assert(Universe::heap()->is_in_permanent_or_null(op.result()), | |
671 "result not in heap"); | |
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672 // If GC was locked out during VM operation then retry allocation |
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673 // and/or stall as necessary. |
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674 if (op.gc_locked()) { |
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675 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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676 continue; // retry and/or stall as necessary |
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677 } |
0 | 678 // If a NULL results is being returned, an out-of-memory |
679 // will be thrown now. Clear the gc_time_limit_exceeded | |
680 // flag to avoid the following situation. | |
681 // gc_time_limit_exceeded is set during a collection | |
682 // the collection fails to return enough space and an OOM is thrown | |
683 // the next GC is skipped because the gc_time_limit_exceeded | |
684 // flag is set and another OOM is thrown | |
685 if (op.result() == NULL) { | |
686 size_policy()->set_gc_time_limit_exceeded(false); | |
687 } | |
688 return op.result(); | |
689 } | |
690 } | |
691 | |
692 // The policy object will prevent us from looping forever. If the | |
693 // time spent in gc crosses a threshold, we will bail out. | |
694 loop_count++; | |
695 if ((QueuedAllocationWarningCount > 0) && | |
696 (loop_count % QueuedAllocationWarningCount == 0)) { | |
697 warning("ParallelScavengeHeap::permanent_mem_allocate retries %d times \n\t" | |
698 " size=%d", loop_count, size); | |
699 } | |
700 } while (result == NULL); | |
701 | |
702 return result; | |
703 } | |
704 | |
705 // | |
706 // This is the policy code for permanent allocations which have failed | |
707 // and require a collection. Note that just as in failed_mem_allocate, | |
708 // we do not set collection policy, only where & when to allocate and | |
709 // collect. | |
710 HeapWord* ParallelScavengeHeap::failed_permanent_mem_allocate(size_t size) { | |
711 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
712 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
713 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
714 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
715 assert(size > perm_gen()->free_in_words(), "Allocation should fail"); | |
716 | |
717 // We assume (and assert!) that an allocation at this point will fail | |
718 // unless we collect. | |
719 | |
720 // First level allocation failure. Mark-sweep and allocate in perm gen. | |
721 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
722 invoke_full_gc(false); | |
723 HeapWord* result = perm_gen()->allocate_permanent(size); | |
724 | |
725 // Second level allocation failure. We're running out of memory. | |
726 if (result == NULL) { | |
727 invoke_full_gc(true); | |
728 result = perm_gen()->allocate_permanent(size); | |
729 } | |
730 | |
731 return result; | |
732 } | |
733 | |
734 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
735 CollectedHeap::ensure_parsability(retire_tlabs); | |
736 young_gen()->eden_space()->ensure_parsability(); | |
737 } | |
738 | |
739 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
740 return young_gen()->eden_space()->free_in_bytes(); | |
741 } | |
742 | |
743 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
744 return young_gen()->eden_space()->tlab_capacity(thr); | |
745 } | |
746 | |
747 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
748 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
749 } | |
750 | |
751 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
752 return young_gen()->allocate(size, true); | |
753 } | |
754 | |
755 void ParallelScavengeHeap::fill_all_tlabs(bool retire) { | |
756 CollectedHeap::fill_all_tlabs(retire); | |
757 } | |
758 | |
759 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
760 CollectedHeap::accumulate_statistics_all_tlabs(); | |
761 } | |
762 | |
763 void ParallelScavengeHeap::resize_all_tlabs() { | |
764 CollectedHeap::resize_all_tlabs(); | |
765 } | |
766 | |
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"); | |
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828 if (Debugging) return NULL; // called from find() in debug.cpp |
0 | 829 Unimplemented(); |
830 } else if (old_gen()->is_in_reserved(addr)) { | |
831 assert(old_gen()->is_in(addr), | |
832 "addr should be in allocated part of old gen"); | |
833 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
834 } else if (perm_gen()->is_in_reserved(addr)) { | |
835 assert(perm_gen()->is_in(addr), | |
836 "addr should be in allocated part of perm gen"); | |
837 return perm_gen()->start_array()->object_start((HeapWord*)addr); | |
838 } | |
839 return 0; | |
840 } | |
841 | |
842 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
843 return oop(addr)->size(); | |
844 } | |
845 | |
846 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
847 return block_start(addr) == addr; | |
848 } | |
849 | |
850 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
851 return UseParallelOldGC ? | |
852 PSParallelCompact::millis_since_last_gc() : | |
853 PSMarkSweep::millis_since_last_gc(); | |
854 } | |
855 | |
856 void ParallelScavengeHeap::prepare_for_verify() { | |
857 ensure_parsability(false); // no need to retire TLABs for verification | |
858 } | |
859 | |
860 void ParallelScavengeHeap::print() const { print_on(tty); } | |
861 | |
862 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
863 young_gen()->print_on(st); | |
864 old_gen()->print_on(st); | |
865 perm_gen()->print_on(st); | |
866 } | |
867 | |
868 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { | |
869 PSScavenge::gc_task_manager()->threads_do(tc); | |
870 } | |
871 | |
872 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
873 PSScavenge::gc_task_manager()->print_threads_on(st); | |
874 } | |
875 | |
876 void ParallelScavengeHeap::print_tracing_info() const { | |
877 if (TraceGen0Time) { | |
878 double time = PSScavenge::accumulated_time()->seconds(); | |
879 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
880 } | |
881 if (TraceGen1Time) { | |
882 double time = PSMarkSweep::accumulated_time()->seconds(); | |
883 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); | |
884 } | |
885 } | |
886 | |
887 | |
888 void ParallelScavengeHeap::verify(bool allow_dirty, bool silent) { | |
889 // Why do we need the total_collections()-filter below? | |
890 if (total_collections() > 0) { | |
891 if (!silent) { | |
892 gclog_or_tty->print("permanent "); | |
893 } | |
894 perm_gen()->verify(allow_dirty); | |
895 | |
896 if (!silent) { | |
897 gclog_or_tty->print("tenured "); | |
898 } | |
899 old_gen()->verify(allow_dirty); | |
900 | |
901 if (!silent) { | |
902 gclog_or_tty->print("eden "); | |
903 } | |
904 young_gen()->verify(allow_dirty); | |
905 } | |
906 if (!silent) { | |
907 gclog_or_tty->print("ref_proc "); | |
908 } | |
909 ReferenceProcessor::verify(); | |
910 } | |
911 | |
912 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
913 if (PrintGCDetails && Verbose) { | |
914 gclog_or_tty->print(" " SIZE_FORMAT | |
915 "->" SIZE_FORMAT | |
916 "(" SIZE_FORMAT ")", | |
917 prev_used, used(), capacity()); | |
918 } else { | |
919 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
920 "->" SIZE_FORMAT "K" | |
921 "(" SIZE_FORMAT "K)", | |
922 prev_used / K, used() / K, capacity() / K); | |
923 } | |
924 } | |
925 | |
926 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
927 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
928 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
929 return _psh; | |
930 } | |
931 | |
932 // Before delegating the resize to the young generation, | |
933 // the reserved space for the young and old generations | |
934 // may be changed to accomodate the desired resize. | |
935 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
936 size_t survivor_size) { | |
937 if (UseAdaptiveGCBoundary) { | |
938 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
939 size_policy()->reset_bytes_absorbed_from_eden(); | |
940 return; // The generation changed size already. | |
941 } | |
942 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
943 } | |
944 | |
945 // Delegate the resize to the generation. | |
946 _young_gen->resize(eden_size, survivor_size); | |
947 } | |
948 | |
949 // Before delegating the resize to the old generation, | |
950 // the reserved space for the young and old generations | |
951 // may be changed to accomodate the desired resize. | |
952 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
953 if (UseAdaptiveGCBoundary) { | |
954 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
955 size_policy()->reset_bytes_absorbed_from_eden(); | |
956 return; // The generation changed size already. | |
957 } | |
958 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
959 } | |
960 | |
961 // Delegate the resize to the generation. | |
962 _old_gen->resize(desired_free_space); | |
963 } | |
263
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964 |
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965 #ifndef PRODUCT |
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966 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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967 if (ZapUnusedHeapArea) { |
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968 young_gen()->record_spaces_top(); |
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969 old_gen()->record_spaces_top(); |
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970 perm_gen()->record_spaces_top(); |
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971 } |
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972 } |
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973 |
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974 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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975 if (ZapUnusedHeapArea) { |
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976 young_gen()->eden_space()->mangle_unused_area(); |
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977 young_gen()->to_space()->mangle_unused_area(); |
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978 young_gen()->from_space()->mangle_unused_area(); |
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979 old_gen()->object_space()->mangle_unused_area(); |
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980 perm_gen()->object_space()->mangle_unused_area(); |
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981 } |
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982 } |
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983 #endif |