1 /*
2 * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "gc/parallel/adjoiningGenerations.hpp"
28 #include "gc/parallel/adjoiningVirtualSpaces.hpp"
29 #include "gc/parallel/cardTableExtension.hpp"
30 #include "gc/parallel/gcTaskManager.hpp"
31 #include "gc/parallel/generationSizer.hpp"
32 #include "gc/parallel/objectStartArray.inline.hpp"
33 #include "gc/parallel/parallelScavengeHeap.inline.hpp"
34 #include "gc/parallel/psAdaptiveSizePolicy.hpp"
35 #include "gc/parallel/psMarkSweep.hpp"
36 #include "gc/parallel/psMemoryPool.hpp"
37 #include "gc/parallel/psParallelCompact.inline.hpp"
38 #include "gc/parallel/psPromotionManager.hpp"
39 #include "gc/parallel/psScavenge.hpp"
40 #include "gc/parallel/vmPSOperations.hpp"
41 #include "gc/shared/gcHeapSummary.hpp"
42 #include "gc/shared/gcLocker.inline.hpp"
43 #include "gc/shared/gcWhen.hpp"
44 #include "logging/log.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "runtime/handles.inline.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/vmThread.hpp"
49 #include "services/memoryManager.hpp"
50 #include "services/memTracker.hpp"
51 #include "utilities/vmError.hpp"
52
53 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL;
54 PSOldGen* ParallelScavengeHeap::_old_gen = NULL;
55 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL;
56 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL;
57 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL;
58
59 jint ParallelScavengeHeap::initialize() {
60 CollectedHeap::pre_initialize();
61
62 const size_t heap_size = _collector_policy->max_heap_byte_size();
63
64 ReservedSpace heap_rs = Universe::reserve_heap(heap_size, _collector_policy->heap_alignment());
65
66 os::trace_page_sizes("Heap",
67 _collector_policy->min_heap_byte_size(),
68 heap_size,
69 generation_alignment(),
70 heap_rs.base(),
71 heap_rs.size());
72
73 initialize_reserved_region((HeapWord*)heap_rs.base(), (HeapWord*)(heap_rs.base() + heap_rs.size()));
74
75 CardTableExtension* const barrier_set = new CardTableExtension(reserved_region());
76 barrier_set->initialize();
77 set_barrier_set(barrier_set);
78
79 // Make up the generations
80 // Calculate the maximum size that a generation can grow. This
81 // includes growth into the other generation. Note that the
82 // parameter _max_gen_size is kept as the maximum
83 // size of the generation as the boundaries currently stand.
84 // _max_gen_size is still used as that value.
85 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0;
86 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0;
87
88 _gens = new AdjoiningGenerations(heap_rs, _collector_policy, generation_alignment());
89
90 _old_gen = _gens->old_gen();
91 _young_gen = _gens->young_gen();
92
93 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes();
94 const size_t old_capacity = _old_gen->capacity_in_bytes();
95 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity);
96 _size_policy =
97 new PSAdaptiveSizePolicy(eden_capacity,
98 initial_promo_size,
99 young_gen()->to_space()->capacity_in_bytes(),
100 _collector_policy->gen_alignment(),
101 max_gc_pause_sec,
102 max_gc_minor_pause_sec,
103 GCTimeRatio
104 );
105
106 assert(!UseAdaptiveGCBoundary ||
107 (old_gen()->virtual_space()->high_boundary() ==
108 young_gen()->virtual_space()->low_boundary()),
109 "Boundaries must meet");
110 // initialize the policy counters - 2 collectors, 2 generations
111 _gc_policy_counters =
112 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 2, _size_policy);
113
114 // Set up the GCTaskManager
115 _gc_task_manager = GCTaskManager::create(ParallelGCThreads);
116
117 if (UseParallelOldGC && !PSParallelCompact::initialize()) {
118 return JNI_ENOMEM;
119 }
120
121 return JNI_OK;
122 }
123
124 void ParallelScavengeHeap::initialize_serviceability() {
125
126 _eden_pool = new EdenMutableSpacePool(_young_gen,
127 _young_gen->eden_space(),
128 "PS Eden Space",
129 false /* support_usage_threshold */);
130
131 _survivor_pool = new SurvivorMutableSpacePool(_young_gen,
132 "PS Survivor Space",
133 false /* support_usage_threshold */);
134
135 _old_pool = new PSGenerationPool(_old_gen,
136 "PS Old Gen",
137 true /* support_usage_threshold */);
138
139 _young_manager = new GCMemoryManager("PS Scavenge", "end of minor GC");
140 _old_manager = new GCMemoryManager("PS MarkSweep", "end of major GC");
141
142 _old_manager->add_pool(_eden_pool);
143 _old_manager->add_pool(_survivor_pool);
144 _old_manager->add_pool(_old_pool);
145
146 _young_manager->add_pool(_eden_pool);
147 _young_manager->add_pool(_survivor_pool);
148
149 }
150
151 void ParallelScavengeHeap::post_initialize() {
152 CollectedHeap::post_initialize();
153 // Need to init the tenuring threshold
154 PSScavenge::initialize();
155 if (UseParallelOldGC) {
156 PSParallelCompact::post_initialize();
157 } else {
158 PSMarkSweep::initialize();
159 }
160 PSPromotionManager::initialize();
161 }
162
163 void ParallelScavengeHeap::update_counters() {
164 young_gen()->update_counters();
165 old_gen()->update_counters();
166 MetaspaceCounters::update_performance_counters();
167 CompressedClassSpaceCounters::update_performance_counters();
168 }
169
170 size_t ParallelScavengeHeap::capacity() const {
171 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes();
172 return value;
173 }
174
175 size_t ParallelScavengeHeap::used() const {
176 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes();
177 return value;
178 }
179
180 bool ParallelScavengeHeap::is_maximal_no_gc() const {
181 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc();
182 }
183
184
185 size_t ParallelScavengeHeap::max_capacity() const {
186 size_t estimated = reserved_region().byte_size();
187 if (UseAdaptiveSizePolicy) {
188 estimated -= _size_policy->max_survivor_size(young_gen()->max_size());
189 } else {
190 estimated -= young_gen()->to_space()->capacity_in_bytes();
191 }
192 return MAX2(estimated, capacity());
193 }
194
195 bool ParallelScavengeHeap::is_in(const void* p) const {
196 return young_gen()->is_in(p) || old_gen()->is_in(p);
197 }
198
199 bool ParallelScavengeHeap::is_in_reserved(const void* p) const {
200 return young_gen()->is_in_reserved(p) || old_gen()->is_in_reserved(p);
201 }
202
203 // There are two levels of allocation policy here.
204 //
205 // When an allocation request fails, the requesting thread must invoke a VM
206 // operation, transfer control to the VM thread, and await the results of a
207 // garbage collection. That is quite expensive, and we should avoid doing it
208 // multiple times if possible.
209 //
210 // To accomplish this, we have a basic allocation policy, and also a
211 // failed allocation policy.
212 //
213 // The basic allocation policy controls how you allocate memory without
214 // attempting garbage collection. It is okay to grab locks and
215 // expand the heap, if that can be done without coming to a safepoint.
216 // It is likely that the basic allocation policy will not be very
217 // aggressive.
218 //
219 // The failed allocation policy is invoked from the VM thread after
220 // the basic allocation policy is unable to satisfy a mem_allocate
221 // request. This policy needs to cover the entire range of collection,
222 // heap expansion, and out-of-memory conditions. It should make every
223 // attempt to allocate the requested memory.
224
225 // Basic allocation policy. Should never be called at a safepoint, or
226 // from the VM thread.
227 //
228 // This method must handle cases where many mem_allocate requests fail
229 // simultaneously. When that happens, only one VM operation will succeed,
230 // and the rest will not be executed. For that reason, this method loops
231 // during failed allocation attempts. If the java heap becomes exhausted,
232 // we rely on the size_policy object to force a bail out.
233 HeapWord* ParallelScavengeHeap::mem_allocate(
234 size_t size,
235 bool* gc_overhead_limit_was_exceeded) {
236 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint");
237 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread");
238 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock");
239
240 // In general gc_overhead_limit_was_exceeded should be false so
241 // set it so here and reset it to true only if the gc time
242 // limit is being exceeded as checked below.
243 *gc_overhead_limit_was_exceeded = false;
244
245 HeapWord* result = young_gen()->allocate(size);
246
247 uint loop_count = 0;
248 uint gc_count = 0;
249 uint gclocker_stalled_count = 0;
250
251 while (result == NULL) {
252 // We don't want to have multiple collections for a single filled generation.
253 // To prevent this, each thread tracks the total_collections() value, and if
254 // the count has changed, does not do a new collection.
255 //
256 // The collection count must be read only while holding the heap lock. VM
257 // operations also hold the heap lock during collections. There is a lock
258 // contention case where thread A blocks waiting on the Heap_lock, while
259 // thread B is holding it doing a collection. When thread A gets the lock,
260 // the collection count has already changed. To prevent duplicate collections,
261 // The policy MUST attempt allocations during the same period it reads the
262 // total_collections() value!
263 {
264 MutexLocker ml(Heap_lock);
265 gc_count = total_collections();
266
267 result = young_gen()->allocate(size);
268 if (result != NULL) {
269 return result;
270 }
271
272 // If certain conditions hold, try allocating from the old gen.
273 result = mem_allocate_old_gen(size);
274 if (result != NULL) {
275 return result;
276 }
277
278 if (gclocker_stalled_count > GCLockerRetryAllocationCount) {
279 return NULL;
280 }
281
282 // Failed to allocate without a gc.
283 if (GCLocker::is_active_and_needs_gc()) {
284 // If this thread is not in a jni critical section, we stall
285 // the requestor until the critical section has cleared and
286 // GC allowed. When the critical section clears, a GC is
287 // initiated by the last thread exiting the critical section; so
288 // we retry the allocation sequence from the beginning of the loop,
289 // rather than causing more, now probably unnecessary, GC attempts.
290 JavaThread* jthr = JavaThread::current();
291 if (!jthr->in_critical()) {
292 MutexUnlocker mul(Heap_lock);
293 GCLocker::stall_until_clear();
294 gclocker_stalled_count += 1;
295 continue;
296 } else {
297 if (CheckJNICalls) {
298 fatal("Possible deadlock due to allocating while"
299 " in jni critical section");
300 }
301 return NULL;
302 }
303 }
304 }
305
306 if (result == NULL) {
307 // Generate a VM operation
308 VM_ParallelGCFailedAllocation op(size, gc_count);
309 VMThread::execute(&op);
310
311 // Did the VM operation execute? If so, return the result directly.
312 // This prevents us from looping until time out on requests that can
313 // not be satisfied.
314 if (op.prologue_succeeded()) {
315 assert(is_in_or_null(op.result()), "result not in heap");
316
317 // If GC was locked out during VM operation then retry allocation
318 // and/or stall as necessary.
319 if (op.gc_locked()) {
320 assert(op.result() == NULL, "must be NULL if gc_locked() is true");
321 continue; // retry and/or stall as necessary
322 }
323
324 // Exit the loop if the gc time limit has been exceeded.
325 // The allocation must have failed above ("result" guarding
326 // this path is NULL) and the most recent collection has exceeded the
327 // gc overhead limit (although enough may have been collected to
328 // satisfy the allocation). Exit the loop so that an out-of-memory
329 // will be thrown (return a NULL ignoring the contents of
330 // op.result()),
331 // but clear gc_overhead_limit_exceeded so that the next collection
332 // starts with a clean slate (i.e., forgets about previous overhead
333 // excesses). Fill op.result() with a filler object so that the
334 // heap remains parsable.
335 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded();
336 const bool softrefs_clear = collector_policy()->all_soft_refs_clear();
337
338 if (limit_exceeded && softrefs_clear) {
339 *gc_overhead_limit_was_exceeded = true;
340 size_policy()->set_gc_overhead_limit_exceeded(false);
341 log_trace(gc)("ParallelScavengeHeap::mem_allocate: return NULL because gc_overhead_limit_exceeded is set");
342 if (op.result() != NULL) {
343 CollectedHeap::fill_with_object(op.result(), size);
344 }
345 return NULL;
346 }
347
348 return op.result();
349 }
350 }
351
352 // The policy object will prevent us from looping forever. If the
353 // time spent in gc crosses a threshold, we will bail out.
354 loop_count++;
355 if ((result == NULL) && (QueuedAllocationWarningCount > 0) &&
356 (loop_count % QueuedAllocationWarningCount == 0)) {
357 log_warning(gc)("ParallelScavengeHeap::mem_allocate retries %d times", loop_count);
358 log_warning(gc)("\tsize=" SIZE_FORMAT, size);
359 }
360 }
361
362 return result;
363 }
364
365 // A "death march" is a series of ultra-slow allocations in which a full gc is
366 // done before each allocation, and after the full gc the allocation still
367 // cannot be satisfied from the young gen. This routine detects that condition;
368 // it should be called after a full gc has been done and the allocation
369 // attempted from the young gen. The parameter 'addr' should be the result of
370 // that young gen allocation attempt.
371 void
372 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) {
373 if (addr != NULL) {
374 _death_march_count = 0; // death march has ended
375 } else if (_death_march_count == 0) {
376 if (should_alloc_in_eden(size)) {
377 _death_march_count = 1; // death march has started
378 }
379 }
380 }
381
382 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) {
383 if (!should_alloc_in_eden(size) || GCLocker::is_active_and_needs_gc()) {
384 // Size is too big for eden, or gc is locked out.
385 return old_gen()->allocate(size);
386 }
387
388 // If a "death march" is in progress, allocate from the old gen a limited
389 // number of times before doing a GC.
390 if (_death_march_count > 0) {
391 if (_death_march_count < 64) {
392 ++_death_march_count;
393 return old_gen()->allocate(size);
394 } else {
395 _death_march_count = 0;
396 }
397 }
398 return NULL;
399 }
400
401 void ParallelScavengeHeap::do_full_collection(bool clear_all_soft_refs) {
402 if (UseParallelOldGC) {
403 // The do_full_collection() parameter clear_all_soft_refs
404 // is interpreted here as maximum_compaction which will
405 // cause SoftRefs to be cleared.
406 bool maximum_compaction = clear_all_soft_refs;
407 PSParallelCompact::invoke(maximum_compaction);
408 } else {
409 PSMarkSweep::invoke(clear_all_soft_refs);
410 }
411 }
412
413 // Failed allocation policy. Must be called from the VM thread, and
414 // only at a safepoint! Note that this method has policy for allocation
415 // flow, and NOT collection policy. So we do not check for gc collection
416 // time over limit here, that is the responsibility of the heap specific
417 // collection methods. This method decides where to attempt allocations,
418 // and when to attempt collections, but no collection specific policy.
419 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) {
420 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
421 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread");
422 assert(!is_gc_active(), "not reentrant");
423 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock");
424
425 // We assume that allocation in eden will fail unless we collect.
426
427 // First level allocation failure, scavenge and allocate in young gen.
428 GCCauseSetter gccs(this, GCCause::_allocation_failure);
429 const bool invoked_full_gc = PSScavenge::invoke();
430 HeapWord* result = young_gen()->allocate(size);
431
432 // Second level allocation failure.
433 // Mark sweep and allocate in young generation.
434 if (result == NULL && !invoked_full_gc) {
435 do_full_collection(false);
436 result = young_gen()->allocate(size);
437 }
438
439 death_march_check(result, size);
440
441 // Third level allocation failure.
442 // After mark sweep and young generation allocation failure,
443 // allocate in old generation.
444 if (result == NULL) {
445 result = old_gen()->allocate(size);
446 }
447
448 // Fourth level allocation failure. We're running out of memory.
449 // More complete mark sweep and allocate in young generation.
450 if (result == NULL) {
451 do_full_collection(true);
452 result = young_gen()->allocate(size);
453 }
454
455 // Fifth level allocation failure.
456 // After more complete mark sweep, allocate in old generation.
457 if (result == NULL) {
458 result = old_gen()->allocate(size);
459 }
460
461 return result;
462 }
463
464 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) {
465 CollectedHeap::ensure_parsability(retire_tlabs);
466 young_gen()->eden_space()->ensure_parsability();
467 }
468
469 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const {
470 return young_gen()->eden_space()->tlab_capacity(thr);
471 }
472
473 size_t ParallelScavengeHeap::tlab_used(Thread* thr) const {
474 return young_gen()->eden_space()->tlab_used(thr);
475 }
476
477 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const {
478 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr);
479 }
480
481 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) {
482 return young_gen()->allocate(size);
483 }
484
485 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() {
486 CollectedHeap::accumulate_statistics_all_tlabs();
487 }
488
489 void ParallelScavengeHeap::resize_all_tlabs() {
490 CollectedHeap::resize_all_tlabs();
491 }
492
493 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) {
494 // We don't need barriers for stores to objects in the
495 // young gen and, a fortiori, for initializing stores to
496 // objects therein.
497 return is_in_young(new_obj);
498 }
499
500 // This method is used by System.gc() and JVMTI.
501 void ParallelScavengeHeap::collect(GCCause::Cause cause) {
502 assert(!Heap_lock->owned_by_self(),
503 "this thread should not own the Heap_lock");
504
505 uint gc_count = 0;
506 uint full_gc_count = 0;
507 {
508 MutexLocker ml(Heap_lock);
509 // This value is guarded by the Heap_lock
510 gc_count = total_collections();
511 full_gc_count = total_full_collections();
512 }
513
514 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause);
515 VMThread::execute(&op);
516 }
517
518 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) {
519 young_gen()->object_iterate(cl);
520 old_gen()->object_iterate(cl);
521 }
522
523
524 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const {
525 if (young_gen()->is_in_reserved(addr)) {
526 assert(young_gen()->is_in(addr),
527 "addr should be in allocated part of young gen");
528 // called from os::print_location by find or VMError
529 if (Debugging || VMError::fatal_error_in_progress()) return NULL;
530 Unimplemented();
531 } else if (old_gen()->is_in_reserved(addr)) {
532 assert(old_gen()->is_in(addr),
533 "addr should be in allocated part of old gen");
534 return old_gen()->start_array()->object_start((HeapWord*)addr);
535 }
536 return 0;
537 }
538
539 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const {
540 return oop(addr)->size();
541 }
542
543 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const {
544 return block_start(addr) == addr;
545 }
546
547 jlong ParallelScavengeHeap::millis_since_last_gc() {
548 return UseParallelOldGC ?
549 PSParallelCompact::millis_since_last_gc() :
550 PSMarkSweep::millis_since_last_gc();
551 }
552
553 void ParallelScavengeHeap::prepare_for_verify() {
554 ensure_parsability(false); // no need to retire TLABs for verification
555 }
556
557 PSHeapSummary ParallelScavengeHeap::create_ps_heap_summary() {
558 PSOldGen* old = old_gen();
559 HeapWord* old_committed_end = (HeapWord*)old->virtual_space()->committed_high_addr();
560 VirtualSpaceSummary old_summary(old->reserved().start(), old_committed_end, old->reserved().end());
561 SpaceSummary old_space(old->reserved().start(), old_committed_end, old->used_in_bytes());
562
563 PSYoungGen* young = young_gen();
564 VirtualSpaceSummary young_summary(young->reserved().start(),
565 (HeapWord*)young->virtual_space()->committed_high_addr(), young->reserved().end());
566
567 MutableSpace* eden = young_gen()->eden_space();
568 SpaceSummary eden_space(eden->bottom(), eden->end(), eden->used_in_bytes());
569
570 MutableSpace* from = young_gen()->from_space();
571 SpaceSummary from_space(from->bottom(), from->end(), from->used_in_bytes());
572
573 MutableSpace* to = young_gen()->to_space();
574 SpaceSummary to_space(to->bottom(), to->end(), to->used_in_bytes());
575
576 VirtualSpaceSummary heap_summary = create_heap_space_summary();
577 return PSHeapSummary(heap_summary, used(), old_summary, old_space, young_summary, eden_space, from_space, to_space);
578 }
579
580 void ParallelScavengeHeap::print_on(outputStream* st) const {
581 young_gen()->print_on(st);
582 old_gen()->print_on(st);
583 MetaspaceAux::print_on(st);
584 }
585
586 void ParallelScavengeHeap::print_on_error(outputStream* st) const {
587 this->CollectedHeap::print_on_error(st);
588
589 if (UseParallelOldGC) {
590 st->cr();
591 PSParallelCompact::print_on_error(st);
592 }
593 }
594
595 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const {
596 PSScavenge::gc_task_manager()->threads_do(tc);
597 }
598
599 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const {
600 PSScavenge::gc_task_manager()->print_threads_on(st);
601 }
602
603 void ParallelScavengeHeap::print_tracing_info() const {
604 AdaptiveSizePolicyOutput::print();
605 log_debug(gc, heap, exit)("Accumulated young generation GC time %3.7f secs", PSScavenge::accumulated_time()->seconds());
606 log_debug(gc, heap, exit)("Accumulated old generation GC time %3.7f secs",
607 UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds());
608 }
609
610
611 void ParallelScavengeHeap::verify(VerifyOption option /* ignored */) {
612 // Why do we need the total_collections()-filter below?
613 if (total_collections() > 0) {
614 log_debug(gc, verify)("Tenured");
615 old_gen()->verify();
616
617 log_debug(gc, verify)("Eden");
618 young_gen()->verify();
619 }
620 }
621
622 void ParallelScavengeHeap::trace_heap(GCWhen::Type when, const GCTracer* gc_tracer) {
623 const PSHeapSummary& heap_summary = create_ps_heap_summary();
624 gc_tracer->report_gc_heap_summary(when, heap_summary);
625
626 const MetaspaceSummary& metaspace_summary = create_metaspace_summary();
627 gc_tracer->report_metaspace_summary(when, metaspace_summary);
628 }
629
630 ParallelScavengeHeap* ParallelScavengeHeap::heap() {
631 CollectedHeap* heap = Universe::heap();
632 assert(heap != NULL, "Uninitialized access to ParallelScavengeHeap::heap()");
633 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Not a ParallelScavengeHeap");
634 return (ParallelScavengeHeap*)heap;
635 }
636
637 // Before delegating the resize to the young generation,
638 // the reserved space for the young and old generations
639 // may be changed to accommodate the desired resize.
640 void ParallelScavengeHeap::resize_young_gen(size_t eden_size,
641 size_t survivor_size) {
642 if (UseAdaptiveGCBoundary) {
643 if (size_policy()->bytes_absorbed_from_eden() != 0) {
644 size_policy()->reset_bytes_absorbed_from_eden();
645 return; // The generation changed size already.
646 }
647 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size);
648 }
649
650 // Delegate the resize to the generation.
651 _young_gen->resize(eden_size, survivor_size);
652 }
653
654 // Before delegating the resize to the old generation,
655 // the reserved space for the young and old generations
656 // may be changed to accommodate the desired resize.
657 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) {
658 if (UseAdaptiveGCBoundary) {
659 if (size_policy()->bytes_absorbed_from_eden() != 0) {
660 size_policy()->reset_bytes_absorbed_from_eden();
661 return; // The generation changed size already.
662 }
663 gens()->adjust_boundary_for_old_gen_needs(desired_free_space);
664 }
665
666 // Delegate the resize to the generation.
667 _old_gen->resize(desired_free_space);
668 }
669
670 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() {
671 // nothing particular
672 }
673
674 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() {
675 // nothing particular
676 }
677
678 #ifndef PRODUCT
679 void ParallelScavengeHeap::record_gen_tops_before_GC() {
680 if (ZapUnusedHeapArea) {
681 young_gen()->record_spaces_top();
682 old_gen()->record_spaces_top();
683 }
684 }
685
686 void ParallelScavengeHeap::gen_mangle_unused_area() {
687 if (ZapUnusedHeapArea) {
688 young_gen()->eden_space()->mangle_unused_area();
689 young_gen()->to_space()->mangle_unused_area();
690 young_gen()->from_space()->mangle_unused_area();
691 old_gen()->object_space()->mangle_unused_area();
692 }
693 }
694 #endif
695
696 bool ParallelScavengeHeap::is_scavengable(oop obj) {
697 return is_in_young(obj);
698 }
699
700 void ParallelScavengeHeap::register_nmethod(nmethod* nm) {
701 CodeCache::register_scavenge_root_nmethod(nm);
702 }
703
704 void ParallelScavengeHeap::verify_nmethod(nmethod* nm) {
705 CodeCache::verify_scavenge_root_nmethod(nm);
706 }
707
708 GrowableArray<GCMemoryManager*> ParallelScavengeHeap::memory_managers() {
709 GrowableArray<GCMemoryManager*> memory_managers(2);
710 memory_managers.append(_young_manager);
711 memory_managers.append(_old_manager);
712 return memory_managers;
713 }
714
715 GrowableArray<MemoryPool*> ParallelScavengeHeap::memory_pools() {
716 GrowableArray<MemoryPool*> memory_pools(3);
717 memory_pools.append(_eden_pool);
718 memory_pools.append(_survivor_pool);
719 memory_pools.append(_old_pool);
720 return memory_pools;
721 }
722
--- EOF ---