519 _objarray_stack.clear(true);
520 }
521
522 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
523 // Recursively traverse all live objects and mark them
524 GCTraceTime tm("phase 1", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id());
525 trace(" 1");
526
527 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
528 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
529
530 // Need to clear claim bits before the tracing starts.
531 ClassLoaderDataGraph::clear_claimed_marks();
532
533 // General strong roots.
534 {
535 ParallelScavengeHeap::ParStrongRootsScope psrs;
536 Universe::oops_do(mark_and_push_closure());
537 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles
538 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure());
539 CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true);
540 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob);
541 ObjectSynchronizer::oops_do(mark_and_push_closure());
542 FlatProfiler::oops_do(mark_and_push_closure());
543 Management::oops_do(mark_and_push_closure());
544 JvmtiExport::oops_do(mark_and_push_closure());
545 SystemDictionary::always_strong_oops_do(mark_and_push_closure());
546 ClassLoaderDataGraph::always_strong_oops_do(mark_and_push_closure(), follow_klass_closure(), true);
547 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
548 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure()));
549 }
550
551 // Flush marking stack.
552 follow_stack();
553
554 // Process reference objects found during marking
555 {
556 ref_processor()->setup_policy(clear_all_softrefs);
557 const ReferenceProcessorStats& stats =
558 ref_processor()->process_discovered_references(
559 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer, _gc_tracer->gc_id());
560 gc_tracer()->report_gc_reference_stats(stats);
561 }
562
563 // This is the point where the entire marking should have completed.
564 assert(_marking_stack.is_empty(), "Marking should have completed");
565
566 // Unload classes and purge the SystemDictionary.
616 trace("3");
617
618 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
619 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
620
621 PSYoungGen* young_gen = heap->young_gen();
622 PSOldGen* old_gen = heap->old_gen();
623
624 // Need to clear claim bits before the tracing starts.
625 ClassLoaderDataGraph::clear_claimed_marks();
626
627 // General strong roots.
628 Universe::oops_do(adjust_pointer_closure());
629 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles
630 CLDToOopClosure adjust_from_cld(adjust_pointer_closure());
631 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL);
632 ObjectSynchronizer::oops_do(adjust_pointer_closure());
633 FlatProfiler::oops_do(adjust_pointer_closure());
634 Management::oops_do(adjust_pointer_closure());
635 JvmtiExport::oops_do(adjust_pointer_closure());
636 // SO_AllClasses
637 SystemDictionary::oops_do(adjust_pointer_closure());
638 ClassLoaderDataGraph::oops_do(adjust_pointer_closure(), adjust_klass_closure(), true);
639
640 // Now adjust pointers in remaining weak roots. (All of which should
641 // have been cleared if they pointed to non-surviving objects.)
642 // Global (weak) JNI handles
643 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure());
644
645 CodeCache::oops_do(adjust_pointer_closure());
646 StringTable::oops_do(adjust_pointer_closure());
647 ref_processor()->weak_oops_do(adjust_pointer_closure());
648 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure());
649
650 adjust_marks();
651
652 young_gen->adjust_pointers();
653 old_gen->adjust_pointers();
654 }
655
656 void PSMarkSweep::mark_sweep_phase4() {
657 EventMark m("4 compact heap");
658 GCTraceTime tm("phase 4", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id());
659 trace("4");
660
661 // All pointers are now adjusted, move objects accordingly
662
663 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
664 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
665
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519 _objarray_stack.clear(true);
520 }
521
522 void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
523 // Recursively traverse all live objects and mark them
524 GCTraceTime tm("phase 1", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id());
525 trace(" 1");
526
527 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
528 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
529
530 // Need to clear claim bits before the tracing starts.
531 ClassLoaderDataGraph::clear_claimed_marks();
532
533 // General strong roots.
534 {
535 ParallelScavengeHeap::ParStrongRootsScope psrs;
536 Universe::oops_do(mark_and_push_closure());
537 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles
538 CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure());
539 MarkingCodeBlobClosure each_active_code_blob(mark_and_push_closure(), !CodeBlobToOopClosure::FixRelocations);
540 Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob);
541 ObjectSynchronizer::oops_do(mark_and_push_closure());
542 FlatProfiler::oops_do(mark_and_push_closure());
543 Management::oops_do(mark_and_push_closure());
544 JvmtiExport::oops_do(mark_and_push_closure());
545 SystemDictionary::always_strong_oops_do(mark_and_push_closure());
546 ClassLoaderDataGraph::always_strong_cld_do(follow_cld_closure());
547 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
548 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure()));
549 }
550
551 // Flush marking stack.
552 follow_stack();
553
554 // Process reference objects found during marking
555 {
556 ref_processor()->setup_policy(clear_all_softrefs);
557 const ReferenceProcessorStats& stats =
558 ref_processor()->process_discovered_references(
559 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer, _gc_tracer->gc_id());
560 gc_tracer()->report_gc_reference_stats(stats);
561 }
562
563 // This is the point where the entire marking should have completed.
564 assert(_marking_stack.is_empty(), "Marking should have completed");
565
566 // Unload classes and purge the SystemDictionary.
616 trace("3");
617
618 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
619 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
620
621 PSYoungGen* young_gen = heap->young_gen();
622 PSOldGen* old_gen = heap->old_gen();
623
624 // Need to clear claim bits before the tracing starts.
625 ClassLoaderDataGraph::clear_claimed_marks();
626
627 // General strong roots.
628 Universe::oops_do(adjust_pointer_closure());
629 JNIHandles::oops_do(adjust_pointer_closure()); // Global (strong) JNI handles
630 CLDToOopClosure adjust_from_cld(adjust_pointer_closure());
631 Threads::oops_do(adjust_pointer_closure(), &adjust_from_cld, NULL);
632 ObjectSynchronizer::oops_do(adjust_pointer_closure());
633 FlatProfiler::oops_do(adjust_pointer_closure());
634 Management::oops_do(adjust_pointer_closure());
635 JvmtiExport::oops_do(adjust_pointer_closure());
636 SystemDictionary::oops_do(adjust_pointer_closure());
637 ClassLoaderDataGraph::cld_do(adjust_cld_closure());
638
639 // Now adjust pointers in remaining weak roots. (All of which should
640 // have been cleared if they pointed to non-surviving objects.)
641 // Global (weak) JNI handles
642 JNIHandles::weak_oops_do(&always_true, adjust_pointer_closure());
643
644 CodeBlobToOopClosure adjust_from_blobs(adjust_pointer_closure(), CodeBlobToOopClosure::FixRelocations);
645 CodeCache::blobs_do(&adjust_from_blobs);
646 StringTable::oops_do(adjust_pointer_closure());
647 ref_processor()->weak_oops_do(adjust_pointer_closure());
648 PSScavenge::reference_processor()->weak_oops_do(adjust_pointer_closure());
649
650 adjust_marks();
651
652 young_gen->adjust_pointers();
653 old_gen->adjust_pointers();
654 }
655
656 void PSMarkSweep::mark_sweep_phase4() {
657 EventMark m("4 compact heap");
658 GCTraceTime tm("phase 4", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id());
659 trace("4");
660
661 // All pointers are now adjusted, move objects accordingly
662
663 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
664 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
665
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