Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 408:52e32c8b317e
6761092: jvm crashes when CDS is enabled.
Summary: CDS hardcoded max c++ virtual method table increased
Reviewed-by: coleenp, xlu, jmasa
author | acorn |
---|---|
date | Wed, 22 Oct 2008 14:48:08 -0400 |
parents | a4b729f5b611 |
children | 660978a2a31a |
rev | line source |
---|---|
0 | 1 /* |
196 | 2 * Copyright 2001-2008 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 | |
107 // The main part of the heap (old gen + young gen) can often use a larger page | |
108 // size than is needed or wanted for the perm gen. Use the "compound | |
109 // alignment" ReservedSpace ctor to avoid having to use the same page size for | |
110 // all gens. | |
237
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111 ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size, |
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112 og_align); |
0 | 113 os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz, |
114 heap_rs.base(), pg_max_size); | |
115 os::trace_page_sizes("ps main", og_min_size + yg_min_size, | |
116 og_max_size + yg_max_size, og_page_sz, | |
117 heap_rs.base() + pg_max_size, | |
118 heap_rs.size() - pg_max_size); | |
119 if (!heap_rs.is_reserved()) { | |
120 vm_shutdown_during_initialization( | |
121 "Could not reserve enough space for object heap"); | |
122 return JNI_ENOMEM; | |
123 } | |
124 | |
125 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
126 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
127 | |
128 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
129 _barrier_set = barrier_set; | |
130 oopDesc::set_bs(_barrier_set); | |
131 if (_barrier_set == NULL) { | |
132 vm_shutdown_during_initialization( | |
133 "Could not reserve enough space for barrier set"); | |
134 return JNI_ENOMEM; | |
135 } | |
136 | |
137 // Initial young gen size is 4 Mb | |
138 // | |
139 // XXX - what about flag_parser.young_gen_size()? | |
140 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
141 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
142 | |
143 // Split the reserved space into perm gen and the main heap (everything else). | |
144 // The main heap uses a different alignment. | |
145 ReservedSpace perm_rs = heap_rs.first_part(pg_max_size); | |
146 ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align); | |
147 | |
148 // Make up the generations | |
149 // Calculate the maximum size that a generation can grow. This | |
150 // includes growth into the other generation. Note that the | |
151 // parameter _max_gen_size is kept as the maximum | |
152 // size of the generation as the boundaries currently stand. | |
153 // _max_gen_size is still used as that value. | |
154 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
155 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
156 | |
157 _gens = new AdjoiningGenerations(main_rs, | |
158 og_cur_size, | |
159 og_min_size, | |
160 og_max_size, | |
161 yg_cur_size, | |
162 yg_min_size, | |
163 yg_max_size, | |
164 yg_align); | |
165 | |
166 _old_gen = _gens->old_gen(); | |
167 _young_gen = _gens->young_gen(); | |
168 | |
169 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
170 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
171 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
172 _size_policy = | |
173 new PSAdaptiveSizePolicy(eden_capacity, | |
174 initial_promo_size, | |
175 young_gen()->to_space()->capacity_in_bytes(), | |
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176 intra_heap_alignment(), |
0 | 177 max_gc_pause_sec, |
178 max_gc_minor_pause_sec, | |
179 GCTimeRatio | |
180 ); | |
181 | |
182 _perm_gen = new PSPermGen(perm_rs, | |
183 pg_align, | |
184 pg_cur_size, | |
185 pg_cur_size, | |
186 pg_max_size, | |
187 "perm", 2); | |
188 | |
189 assert(!UseAdaptiveGCBoundary || | |
190 (old_gen()->virtual_space()->high_boundary() == | |
191 young_gen()->virtual_space()->low_boundary()), | |
192 "Boundaries must meet"); | |
193 // initialize the policy counters - 2 collectors, 3 generations | |
194 _gc_policy_counters = | |
195 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
196 _psh = this; | |
197 | |
198 // Set up the GCTaskManager | |
199 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
200 | |
201 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
202 return JNI_ENOMEM; | |
203 } | |
204 | |
205 return JNI_OK; | |
206 } | |
207 | |
208 void ParallelScavengeHeap::post_initialize() { | |
209 // Need to init the tenuring threshold | |
210 PSScavenge::initialize(); | |
211 if (UseParallelOldGC) { | |
212 PSParallelCompact::post_initialize(); | |
213 } else { | |
214 PSMarkSweep::initialize(); | |
215 } | |
216 PSPromotionManager::initialize(); | |
217 } | |
218 | |
219 void ParallelScavengeHeap::update_counters() { | |
220 young_gen()->update_counters(); | |
221 old_gen()->update_counters(); | |
222 perm_gen()->update_counters(); | |
223 } | |
224 | |
225 size_t ParallelScavengeHeap::capacity() const { | |
226 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
227 return value; | |
228 } | |
229 | |
230 size_t ParallelScavengeHeap::used() const { | |
231 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
232 return value; | |
233 } | |
234 | |
235 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
236 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
237 } | |
238 | |
239 | |
240 size_t ParallelScavengeHeap::permanent_capacity() const { | |
241 return perm_gen()->capacity_in_bytes(); | |
242 } | |
243 | |
244 size_t ParallelScavengeHeap::permanent_used() const { | |
245 return perm_gen()->used_in_bytes(); | |
246 } | |
247 | |
248 size_t ParallelScavengeHeap::max_capacity() const { | |
249 size_t estimated = reserved_region().byte_size(); | |
250 estimated -= perm_gen()->reserved().byte_size(); | |
251 if (UseAdaptiveSizePolicy) { | |
252 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
253 } else { | |
254 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
255 } | |
256 return MAX2(estimated, capacity()); | |
257 } | |
258 | |
259 bool ParallelScavengeHeap::is_in(const void* p) const { | |
260 if (young_gen()->is_in(p)) { | |
261 return true; | |
262 } | |
263 | |
264 if (old_gen()->is_in(p)) { | |
265 return true; | |
266 } | |
267 | |
268 if (perm_gen()->is_in(p)) { | |
269 return true; | |
270 } | |
271 | |
272 return false; | |
273 } | |
274 | |
275 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
276 if (young_gen()->is_in_reserved(p)) { | |
277 return true; | |
278 } | |
279 | |
280 if (old_gen()->is_in_reserved(p)) { | |
281 return true; | |
282 } | |
283 | |
284 if (perm_gen()->is_in_reserved(p)) { | |
285 return true; | |
286 } | |
287 | |
288 return false; | |
289 } | |
290 | |
291 // Static method | |
292 bool ParallelScavengeHeap::is_in_young(oop* p) { | |
293 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
294 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, | |
295 "Must be ParallelScavengeHeap"); | |
296 | |
297 PSYoungGen* young_gen = heap->young_gen(); | |
298 | |
299 if (young_gen->is_in_reserved(p)) { | |
300 return true; | |
301 } | |
302 | |
303 return false; | |
304 } | |
305 | |
306 // Static method | |
307 bool ParallelScavengeHeap::is_in_old_or_perm(oop* p) { | |
308 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
309 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, | |
310 "Must be ParallelScavengeHeap"); | |
311 | |
312 PSOldGen* old_gen = heap->old_gen(); | |
313 PSPermGen* perm_gen = heap->perm_gen(); | |
314 | |
315 if (old_gen->is_in_reserved(p)) { | |
316 return true; | |
317 } | |
318 | |
319 if (perm_gen->is_in_reserved(p)) { | |
320 return true; | |
321 } | |
322 | |
323 return false; | |
324 } | |
325 | |
326 // There are two levels of allocation policy here. | |
327 // | |
328 // When an allocation request fails, the requesting thread must invoke a VM | |
329 // operation, transfer control to the VM thread, and await the results of a | |
330 // garbage collection. That is quite expensive, and we should avoid doing it | |
331 // multiple times if possible. | |
332 // | |
333 // To accomplish this, we have a basic allocation policy, and also a | |
334 // failed allocation policy. | |
335 // | |
336 // The basic allocation policy controls how you allocate memory without | |
337 // attempting garbage collection. It is okay to grab locks and | |
338 // expand the heap, if that can be done without coming to a safepoint. | |
339 // It is likely that the basic allocation policy will not be very | |
340 // aggressive. | |
341 // | |
342 // The failed allocation policy is invoked from the VM thread after | |
343 // the basic allocation policy is unable to satisfy a mem_allocate | |
344 // request. This policy needs to cover the entire range of collection, | |
345 // heap expansion, and out-of-memory conditions. It should make every | |
346 // attempt to allocate the requested memory. | |
347 | |
348 // Basic allocation policy. Should never be called at a safepoint, or | |
349 // from the VM thread. | |
350 // | |
351 // This method must handle cases where many mem_allocate requests fail | |
352 // simultaneously. When that happens, only one VM operation will succeed, | |
353 // and the rest will not be executed. For that reason, this method loops | |
354 // during failed allocation attempts. If the java heap becomes exhausted, | |
355 // we rely on the size_policy object to force a bail out. | |
356 HeapWord* ParallelScavengeHeap::mem_allocate( | |
357 size_t size, | |
358 bool is_noref, | |
359 bool is_tlab, | |
360 bool* gc_overhead_limit_was_exceeded) { | |
361 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
362 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
363 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
364 | |
365 HeapWord* result = young_gen()->allocate(size, is_tlab); | |
366 | |
367 uint loop_count = 0; | |
368 uint gc_count = 0; | |
369 | |
370 while (result == NULL) { | |
371 // We don't want to have multiple collections for a single filled generation. | |
372 // To prevent this, each thread tracks the total_collections() value, and if | |
373 // the count has changed, does not do a new collection. | |
374 // | |
375 // The collection count must be read only while holding the heap lock. VM | |
376 // operations also hold the heap lock during collections. There is a lock | |
377 // contention case where thread A blocks waiting on the Heap_lock, while | |
378 // thread B is holding it doing a collection. When thread A gets the lock, | |
379 // the collection count has already changed. To prevent duplicate collections, | |
380 // The policy MUST attempt allocations during the same period it reads the | |
381 // total_collections() value! | |
382 { | |
383 MutexLocker ml(Heap_lock); | |
384 gc_count = Universe::heap()->total_collections(); | |
385 | |
386 result = young_gen()->allocate(size, is_tlab); | |
387 | |
388 // (1) If the requested object is too large to easily fit in the | |
389 // young_gen, or | |
390 // (2) If GC is locked out via GCLocker, young gen is full and | |
391 // the need for a GC already signalled to GCLocker (done | |
392 // at a safepoint), | |
393 // ... then, rather than force a safepoint and (a potentially futile) | |
394 // collection (attempt) for each allocation, try allocation directly | |
395 // in old_gen. For case (2) above, we may in the future allow | |
396 // TLAB allocation directly in the old gen. | |
397 if (result != NULL) { | |
398 return result; | |
399 } | |
400 if (!is_tlab && | |
373
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401 size >= (young_gen()->eden_space()->capacity_in_words(Thread::current()) / 2)) { |
0 | 402 result = old_gen()->allocate(size, is_tlab); |
403 if (result != NULL) { | |
404 return result; | |
405 } | |
406 } | |
407 if (GC_locker::is_active_and_needs_gc()) { | |
408 // GC is locked out. If this is a TLAB allocation, | |
409 // return NULL; the requestor will retry allocation | |
410 // of an idividual object at a time. | |
411 if (is_tlab) { | |
412 return NULL; | |
413 } | |
414 | |
415 // If this thread is not in a jni critical section, we stall | |
416 // the requestor until the critical section has cleared and | |
417 // GC allowed. When the critical section clears, a GC is | |
418 // initiated by the last thread exiting the critical section; so | |
419 // we retry the allocation sequence from the beginning of the loop, | |
420 // rather than causing more, now probably unnecessary, GC attempts. | |
421 JavaThread* jthr = JavaThread::current(); | |
422 if (!jthr->in_critical()) { | |
423 MutexUnlocker mul(Heap_lock); | |
424 GC_locker::stall_until_clear(); | |
425 continue; | |
426 } else { | |
427 if (CheckJNICalls) { | |
428 fatal("Possible deadlock due to allocating while" | |
429 " in jni critical section"); | |
430 } | |
431 return NULL; | |
432 } | |
433 } | |
434 } | |
435 | |
436 if (result == NULL) { | |
437 | |
438 // Exit the loop if if the gc time limit has been exceeded. | |
439 // The allocation must have failed above (result must be NULL), | |
440 // and the most recent collection must have exceeded the | |
441 // gc time limit. Exit the loop so that an out-of-memory | |
442 // will be thrown (returning a NULL will do that), but | |
443 // clear gc_time_limit_exceeded so that the next collection | |
444 // will succeeded if the applications decides to handle the | |
445 // out-of-memory and tries to go on. | |
446 *gc_overhead_limit_was_exceeded = size_policy()->gc_time_limit_exceeded(); | |
447 if (size_policy()->gc_time_limit_exceeded()) { | |
448 size_policy()->set_gc_time_limit_exceeded(false); | |
449 if (PrintGCDetails && Verbose) { | |
450 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " | |
451 "return NULL because gc_time_limit_exceeded is set"); | |
452 } | |
453 return NULL; | |
454 } | |
455 | |
456 // Generate a VM operation | |
457 VM_ParallelGCFailedAllocation op(size, is_tlab, gc_count); | |
458 VMThread::execute(&op); | |
459 | |
460 // Did the VM operation execute? If so, return the result directly. | |
461 // This prevents us from looping until time out on requests that can | |
462 // not be satisfied. | |
463 if (op.prologue_succeeded()) { | |
464 assert(Universe::heap()->is_in_or_null(op.result()), | |
465 "result not in heap"); | |
466 | |
467 // If GC was locked out during VM operation then retry allocation | |
468 // and/or stall as necessary. | |
469 if (op.gc_locked()) { | |
470 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
471 continue; // retry and/or stall as necessary | |
472 } | |
473 // If a NULL result is being returned, an out-of-memory | |
474 // will be thrown now. Clear the gc_time_limit_exceeded | |
475 // flag to avoid the following situation. | |
476 // gc_time_limit_exceeded is set during a collection | |
477 // the collection fails to return enough space and an OOM is thrown | |
478 // the next GC is skipped because the gc_time_limit_exceeded | |
479 // flag is set and another OOM is thrown | |
480 if (op.result() == NULL) { | |
481 size_policy()->set_gc_time_limit_exceeded(false); | |
482 } | |
483 return op.result(); | |
484 } | |
485 } | |
486 | |
487 // The policy object will prevent us from looping forever. If the | |
488 // time spent in gc crosses a threshold, we will bail out. | |
489 loop_count++; | |
490 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
491 (loop_count % QueuedAllocationWarningCount == 0)) { | |
492 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
493 " size=%d %s", loop_count, size, is_tlab ? "(TLAB)" : ""); | |
494 } | |
495 } | |
496 | |
497 return result; | |
498 } | |
499 | |
500 // Failed allocation policy. Must be called from the VM thread, and | |
501 // only at a safepoint! Note that this method has policy for allocation | |
502 // flow, and NOT collection policy. So we do not check for gc collection | |
503 // time over limit here, that is the responsibility of the heap specific | |
504 // collection methods. This method decides where to attempt allocations, | |
505 // and when to attempt collections, but no collection specific policy. | |
506 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size, bool is_tlab) { | |
507 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
508 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
509 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
510 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
511 | |
512 size_t mark_sweep_invocation_count = total_invocations(); | |
513 | |
514 // We assume (and assert!) that an allocation at this point will fail | |
515 // unless we collect. | |
516 | |
517 // First level allocation failure, scavenge and allocate in young gen. | |
518 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
519 PSScavenge::invoke(); | |
520 HeapWord* result = young_gen()->allocate(size, is_tlab); | |
521 | |
522 // Second level allocation failure. | |
523 // Mark sweep and allocate in young generation. | |
524 if (result == NULL) { | |
525 // There is some chance the scavenge method decided to invoke mark_sweep. | |
526 // Don't mark sweep twice if so. | |
527 if (mark_sweep_invocation_count == total_invocations()) { | |
528 invoke_full_gc(false); | |
529 result = young_gen()->allocate(size, is_tlab); | |
530 } | |
531 } | |
532 | |
533 // Third level allocation failure. | |
534 // After mark sweep and young generation allocation failure, | |
535 // allocate in old generation. | |
536 if (result == NULL && !is_tlab) { | |
537 result = old_gen()->allocate(size, is_tlab); | |
538 } | |
539 | |
540 // Fourth level allocation failure. We're running out of memory. | |
541 // More complete mark sweep and allocate in young generation. | |
542 if (result == NULL) { | |
543 invoke_full_gc(true); | |
544 result = young_gen()->allocate(size, is_tlab); | |
545 } | |
546 | |
547 // Fifth level allocation failure. | |
548 // After more complete mark sweep, allocate in old generation. | |
549 if (result == NULL && !is_tlab) { | |
550 result = old_gen()->allocate(size, is_tlab); | |
551 } | |
552 | |
553 return result; | |
554 } | |
555 | |
556 // | |
557 // This is the policy loop for allocating in the permanent generation. | |
558 // If the initial allocation fails, we create a vm operation which will | |
559 // cause a collection. | |
560 HeapWord* ParallelScavengeHeap::permanent_mem_allocate(size_t size) { | |
561 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
562 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
563 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
564 | |
565 HeapWord* result; | |
566 | |
567 uint loop_count = 0; | |
568 uint gc_count = 0; | |
569 uint full_gc_count = 0; | |
570 | |
571 do { | |
572 // We don't want to have multiple collections for a single filled generation. | |
573 // To prevent this, each thread tracks the total_collections() value, and if | |
574 // the count has changed, does not do a new collection. | |
575 // | |
576 // The collection count must be read only while holding the heap lock. VM | |
577 // operations also hold the heap lock during collections. There is a lock | |
578 // contention case where thread A blocks waiting on the Heap_lock, while | |
579 // thread B is holding it doing a collection. When thread A gets the lock, | |
580 // the collection count has already changed. To prevent duplicate collections, | |
581 // The policy MUST attempt allocations during the same period it reads the | |
582 // total_collections() value! | |
583 { | |
584 MutexLocker ml(Heap_lock); | |
585 gc_count = Universe::heap()->total_collections(); | |
586 full_gc_count = Universe::heap()->total_full_collections(); | |
587 | |
588 result = perm_gen()->allocate_permanent(size); | |
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589 |
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590 if (result != NULL) { |
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591 return result; |
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592 } |
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593 |
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594 if (GC_locker::is_active_and_needs_gc()) { |
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595 // If this thread is not in a jni critical section, we stall |
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596 // the requestor until the critical section has cleared and |
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597 // GC allowed. When the critical section clears, a GC is |
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598 // initiated by the last thread exiting the critical section; so |
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599 // we retry the allocation sequence from the beginning of the loop, |
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600 // rather than causing more, now probably unnecessary, GC attempts. |
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601 JavaThread* jthr = JavaThread::current(); |
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602 if (!jthr->in_critical()) { |
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603 MutexUnlocker mul(Heap_lock); |
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604 GC_locker::stall_until_clear(); |
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605 continue; |
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606 } else { |
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607 if (CheckJNICalls) { |
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608 fatal("Possible deadlock due to allocating while" |
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609 " in jni critical section"); |
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610 } |
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611 return NULL; |
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612 } |
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613 } |
0 | 614 } |
615 | |
616 if (result == NULL) { | |
617 | |
618 // Exit the loop if the gc time limit has been exceeded. | |
619 // The allocation must have failed above (result must be NULL), | |
620 // and the most recent collection must have exceeded the | |
621 // gc time limit. Exit the loop so that an out-of-memory | |
622 // will be thrown (returning a NULL will do that), but | |
623 // clear gc_time_limit_exceeded so that the next collection | |
624 // will succeeded if the applications decides to handle the | |
625 // out-of-memory and tries to go on. | |
626 if (size_policy()->gc_time_limit_exceeded()) { | |
627 size_policy()->set_gc_time_limit_exceeded(false); | |
628 if (PrintGCDetails && Verbose) { | |
629 gclog_or_tty->print_cr("ParallelScavengeHeap::permanent_mem_allocate: " | |
630 "return NULL because gc_time_limit_exceeded is set"); | |
631 } | |
632 assert(result == NULL, "Allocation did not fail"); | |
633 return NULL; | |
634 } | |
635 | |
636 // Generate a VM operation | |
637 VM_ParallelGCFailedPermanentAllocation op(size, gc_count, full_gc_count); | |
638 VMThread::execute(&op); | |
639 | |
640 // Did the VM operation execute? If so, return the result directly. | |
641 // This prevents us from looping until time out on requests that can | |
642 // not be satisfied. | |
643 if (op.prologue_succeeded()) { | |
644 assert(Universe::heap()->is_in_permanent_or_null(op.result()), | |
645 "result not in heap"); | |
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646 // If GC was locked out during VM operation then retry allocation |
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647 // and/or stall as necessary. |
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648 if (op.gc_locked()) { |
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649 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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650 continue; // retry and/or stall as necessary |
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651 } |
0 | 652 // If a NULL results is being returned, an out-of-memory |
653 // will be thrown now. Clear the gc_time_limit_exceeded | |
654 // flag to avoid the following situation. | |
655 // gc_time_limit_exceeded is set during a collection | |
656 // the collection fails to return enough space and an OOM is thrown | |
657 // the next GC is skipped because the gc_time_limit_exceeded | |
658 // flag is set and another OOM is thrown | |
659 if (op.result() == NULL) { | |
660 size_policy()->set_gc_time_limit_exceeded(false); | |
661 } | |
662 return op.result(); | |
663 } | |
664 } | |
665 | |
666 // The policy object will prevent us from looping forever. If the | |
667 // time spent in gc crosses a threshold, we will bail out. | |
668 loop_count++; | |
669 if ((QueuedAllocationWarningCount > 0) && | |
670 (loop_count % QueuedAllocationWarningCount == 0)) { | |
671 warning("ParallelScavengeHeap::permanent_mem_allocate retries %d times \n\t" | |
672 " size=%d", loop_count, size); | |
673 } | |
674 } while (result == NULL); | |
675 | |
676 return result; | |
677 } | |
678 | |
679 // | |
680 // This is the policy code for permanent allocations which have failed | |
681 // and require a collection. Note that just as in failed_mem_allocate, | |
682 // we do not set collection policy, only where & when to allocate and | |
683 // collect. | |
684 HeapWord* ParallelScavengeHeap::failed_permanent_mem_allocate(size_t size) { | |
685 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
686 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
687 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
688 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
689 assert(size > perm_gen()->free_in_words(), "Allocation should fail"); | |
690 | |
691 // We assume (and assert!) that an allocation at this point will fail | |
692 // unless we collect. | |
693 | |
694 // First level allocation failure. Mark-sweep and allocate in perm gen. | |
695 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
696 invoke_full_gc(false); | |
697 HeapWord* result = perm_gen()->allocate_permanent(size); | |
698 | |
699 // Second level allocation failure. We're running out of memory. | |
700 if (result == NULL) { | |
701 invoke_full_gc(true); | |
702 result = perm_gen()->allocate_permanent(size); | |
703 } | |
704 | |
705 return result; | |
706 } | |
707 | |
708 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
709 CollectedHeap::ensure_parsability(retire_tlabs); | |
710 young_gen()->eden_space()->ensure_parsability(); | |
711 } | |
712 | |
713 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
714 return young_gen()->eden_space()->free_in_bytes(); | |
715 } | |
716 | |
717 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
718 return young_gen()->eden_space()->tlab_capacity(thr); | |
719 } | |
720 | |
721 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
722 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
723 } | |
724 | |
725 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
726 return young_gen()->allocate(size, true); | |
727 } | |
728 | |
729 void ParallelScavengeHeap::fill_all_tlabs(bool retire) { | |
730 CollectedHeap::fill_all_tlabs(retire); | |
731 } | |
732 | |
733 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
734 CollectedHeap::accumulate_statistics_all_tlabs(); | |
735 } | |
736 | |
737 void ParallelScavengeHeap::resize_all_tlabs() { | |
738 CollectedHeap::resize_all_tlabs(); | |
739 } | |
740 | |
741 // This method is used by System.gc() and JVMTI. | |
742 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
743 assert(!Heap_lock->owned_by_self(), | |
744 "this thread should not own the Heap_lock"); | |
745 | |
746 unsigned int gc_count = 0; | |
747 unsigned int full_gc_count = 0; | |
748 { | |
749 MutexLocker ml(Heap_lock); | |
750 // This value is guarded by the Heap_lock | |
751 gc_count = Universe::heap()->total_collections(); | |
752 full_gc_count = Universe::heap()->total_full_collections(); | |
753 } | |
754 | |
755 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
756 VMThread::execute(&op); | |
757 } | |
758 | |
759 // This interface assumes that it's being called by the | |
760 // vm thread. It collects the heap assuming that the | |
761 // heap lock is already held and that we are executing in | |
762 // the context of the vm thread. | |
763 void ParallelScavengeHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
764 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
765 assert(Heap_lock->is_locked(), "Precondition#2"); | |
766 GCCauseSetter gcs(this, cause); | |
767 switch (cause) { | |
768 case GCCause::_heap_inspection: | |
769 case GCCause::_heap_dump: { | |
770 HandleMark hm; | |
771 invoke_full_gc(false); | |
772 break; | |
773 } | |
774 default: // XXX FIX ME | |
775 ShouldNotReachHere(); | |
776 } | |
777 } | |
778 | |
779 | |
780 void ParallelScavengeHeap::oop_iterate(OopClosure* cl) { | |
781 Unimplemented(); | |
782 } | |
783 | |
784 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
785 young_gen()->object_iterate(cl); | |
786 old_gen()->object_iterate(cl); | |
787 perm_gen()->object_iterate(cl); | |
788 } | |
789 | |
790 void ParallelScavengeHeap::permanent_oop_iterate(OopClosure* cl) { | |
791 Unimplemented(); | |
792 } | |
793 | |
794 void ParallelScavengeHeap::permanent_object_iterate(ObjectClosure* cl) { | |
795 perm_gen()->object_iterate(cl); | |
796 } | |
797 | |
798 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
799 if (young_gen()->is_in_reserved(addr)) { | |
800 assert(young_gen()->is_in(addr), | |
801 "addr should be in allocated part of young gen"); | |
802 Unimplemented(); | |
803 } else if (old_gen()->is_in_reserved(addr)) { | |
804 assert(old_gen()->is_in(addr), | |
805 "addr should be in allocated part of old gen"); | |
806 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
807 } else if (perm_gen()->is_in_reserved(addr)) { | |
808 assert(perm_gen()->is_in(addr), | |
809 "addr should be in allocated part of perm gen"); | |
810 return perm_gen()->start_array()->object_start((HeapWord*)addr); | |
811 } | |
812 return 0; | |
813 } | |
814 | |
815 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
816 return oop(addr)->size(); | |
817 } | |
818 | |
819 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
820 return block_start(addr) == addr; | |
821 } | |
822 | |
823 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
824 return UseParallelOldGC ? | |
825 PSParallelCompact::millis_since_last_gc() : | |
826 PSMarkSweep::millis_since_last_gc(); | |
827 } | |
828 | |
829 void ParallelScavengeHeap::prepare_for_verify() { | |
830 ensure_parsability(false); // no need to retire TLABs for verification | |
831 } | |
832 | |
833 void ParallelScavengeHeap::print() const { print_on(tty); } | |
834 | |
835 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
836 young_gen()->print_on(st); | |
837 old_gen()->print_on(st); | |
838 perm_gen()->print_on(st); | |
839 } | |
840 | |
841 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { | |
842 PSScavenge::gc_task_manager()->threads_do(tc); | |
843 } | |
844 | |
845 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
846 PSScavenge::gc_task_manager()->print_threads_on(st); | |
847 } | |
848 | |
849 void ParallelScavengeHeap::print_tracing_info() const { | |
850 if (TraceGen0Time) { | |
851 double time = PSScavenge::accumulated_time()->seconds(); | |
852 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
853 } | |
854 if (TraceGen1Time) { | |
855 double time = PSMarkSweep::accumulated_time()->seconds(); | |
856 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); | |
857 } | |
858 } | |
859 | |
860 | |
861 void ParallelScavengeHeap::verify(bool allow_dirty, bool silent) { | |
862 // Why do we need the total_collections()-filter below? | |
863 if (total_collections() > 0) { | |
864 if (!silent) { | |
865 gclog_or_tty->print("permanent "); | |
866 } | |
867 perm_gen()->verify(allow_dirty); | |
868 | |
869 if (!silent) { | |
870 gclog_or_tty->print("tenured "); | |
871 } | |
872 old_gen()->verify(allow_dirty); | |
873 | |
874 if (!silent) { | |
875 gclog_or_tty->print("eden "); | |
876 } | |
877 young_gen()->verify(allow_dirty); | |
878 } | |
879 if (!silent) { | |
880 gclog_or_tty->print("ref_proc "); | |
881 } | |
882 ReferenceProcessor::verify(); | |
883 } | |
884 | |
885 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
886 if (PrintGCDetails && Verbose) { | |
887 gclog_or_tty->print(" " SIZE_FORMAT | |
888 "->" SIZE_FORMAT | |
889 "(" SIZE_FORMAT ")", | |
890 prev_used, used(), capacity()); | |
891 } else { | |
892 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
893 "->" SIZE_FORMAT "K" | |
894 "(" SIZE_FORMAT "K)", | |
895 prev_used / K, used() / K, capacity() / K); | |
896 } | |
897 } | |
898 | |
899 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
900 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
901 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
902 return _psh; | |
903 } | |
904 | |
905 // Before delegating the resize to the young generation, | |
906 // the reserved space for the young and old generations | |
907 // may be changed to accomodate the desired resize. | |
908 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
909 size_t survivor_size) { | |
910 if (UseAdaptiveGCBoundary) { | |
911 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
912 size_policy()->reset_bytes_absorbed_from_eden(); | |
913 return; // The generation changed size already. | |
914 } | |
915 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
916 } | |
917 | |
918 // Delegate the resize to the generation. | |
919 _young_gen->resize(eden_size, survivor_size); | |
920 } | |
921 | |
922 // Before delegating the resize to the old generation, | |
923 // the reserved space for the young and old generations | |
924 // may be changed to accomodate the desired resize. | |
925 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
926 if (UseAdaptiveGCBoundary) { | |
927 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
928 size_policy()->reset_bytes_absorbed_from_eden(); | |
929 return; // The generation changed size already. | |
930 } | |
931 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
932 } | |
933 | |
934 // Delegate the resize to the generation. | |
935 _old_gen->resize(desired_free_space); | |
936 } | |
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937 |
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938 #ifndef PRODUCT |
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939 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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940 if (ZapUnusedHeapArea) { |
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941 young_gen()->record_spaces_top(); |
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942 old_gen()->record_spaces_top(); |
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943 perm_gen()->record_spaces_top(); |
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944 } |
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945 } |
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946 |
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947 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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948 if (ZapUnusedHeapArea) { |
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949 young_gen()->eden_space()->mangle_unused_area(); |
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950 young_gen()->to_space()->mangle_unused_area(); |
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951 young_gen()->from_space()->mangle_unused_area(); |
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952 old_gen()->object_space()->mangle_unused_area(); |
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953 perm_gen()->object_space()->mangle_unused_area(); |
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954 } |
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955 } |
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956 #endif |