566 _gc_timer->register_gc_start();
567 DefNewTracer gc_tracer;
568 gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start());
569
570 _old_gen = gch->old_gen();
571
572 // If the next generation is too full to accommodate promotion
573 // from this generation, pass on collection; let the next generation
574 // do it.
575 if (!collection_attempt_is_safe()) {
576 if (Verbose && PrintGCDetails) {
577 gclog_or_tty->print(" :: Collection attempt not safe :: ");
578 }
579 gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one
580 return;
581 }
582 assert(to()->is_empty(), "Else not collection_attempt_is_safe");
583
584 init_assuming_no_promotion_failure();
585
586 GCTraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL, gc_tracer.gc_id());
587 // Capture heap used before collection (for printing).
588 size_t gch_prev_used = gch->used();
589
590 gch->trace_heap_before_gc(&gc_tracer);
591
592 // These can be shared for all code paths
593 IsAliveClosure is_alive(this);
594 ScanWeakRefClosure scan_weak_ref(this);
595
596 age_table()->clear();
597 to()->clear(SpaceDecorator::Mangle);
598
599 gch->rem_set()->prepare_for_younger_refs_iterate(false);
600
601 assert(gch->no_allocs_since_save_marks(),
602 "save marks have not been newly set.");
603
604 // Not very pretty.
605 CollectorPolicy* cp = gch->collector_policy();
606
629
630 gch->gen_process_roots(&srs,
631 GenCollectedHeap::YoungGen,
632 true, // Process younger gens, if any,
633 // as strong roots.
634 GenCollectedHeap::SO_ScavengeCodeCache,
635 GenCollectedHeap::StrongAndWeakRoots,
636 &fsc_with_no_gc_barrier,
637 &fsc_with_gc_barrier,
638 &cld_scan_closure);
639 }
640
641 // "evacuate followers".
642 evacuate_followers.do_void();
643
644 FastKeepAliveClosure keep_alive(this, &scan_weak_ref);
645 ReferenceProcessor* rp = ref_processor();
646 rp->setup_policy(clear_all_soft_refs);
647 const ReferenceProcessorStats& stats =
648 rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers,
649 NULL, _gc_timer, gc_tracer.gc_id());
650 gc_tracer.report_gc_reference_stats(stats);
651
652 if (!_promotion_failed) {
653 // Swap the survivor spaces.
654 eden()->clear(SpaceDecorator::Mangle);
655 from()->clear(SpaceDecorator::Mangle);
656 if (ZapUnusedHeapArea) {
657 // This is now done here because of the piece-meal mangling which
658 // can check for valid mangling at intermediate points in the
659 // collection(s). When a young collection fails to collect
660 // sufficient space resizing of the young generation can occur
661 // an redistribute the spaces in the young generation. Mangle
662 // here so that unzapped regions don't get distributed to
663 // other spaces.
664 to()->mangle_unused_area();
665 }
666 swap_spaces();
667
668 assert(to()->is_empty(), "to space should be empty now");
669
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566 _gc_timer->register_gc_start();
567 DefNewTracer gc_tracer;
568 gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start());
569
570 _old_gen = gch->old_gen();
571
572 // If the next generation is too full to accommodate promotion
573 // from this generation, pass on collection; let the next generation
574 // do it.
575 if (!collection_attempt_is_safe()) {
576 if (Verbose && PrintGCDetails) {
577 gclog_or_tty->print(" :: Collection attempt not safe :: ");
578 }
579 gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one
580 return;
581 }
582 assert(to()->is_empty(), "Else not collection_attempt_is_safe");
583
584 init_assuming_no_promotion_failure();
585
586 GCTraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL);
587 // Capture heap used before collection (for printing).
588 size_t gch_prev_used = gch->used();
589
590 gch->trace_heap_before_gc(&gc_tracer);
591
592 // These can be shared for all code paths
593 IsAliveClosure is_alive(this);
594 ScanWeakRefClosure scan_weak_ref(this);
595
596 age_table()->clear();
597 to()->clear(SpaceDecorator::Mangle);
598
599 gch->rem_set()->prepare_for_younger_refs_iterate(false);
600
601 assert(gch->no_allocs_since_save_marks(),
602 "save marks have not been newly set.");
603
604 // Not very pretty.
605 CollectorPolicy* cp = gch->collector_policy();
606
629
630 gch->gen_process_roots(&srs,
631 GenCollectedHeap::YoungGen,
632 true, // Process younger gens, if any,
633 // as strong roots.
634 GenCollectedHeap::SO_ScavengeCodeCache,
635 GenCollectedHeap::StrongAndWeakRoots,
636 &fsc_with_no_gc_barrier,
637 &fsc_with_gc_barrier,
638 &cld_scan_closure);
639 }
640
641 // "evacuate followers".
642 evacuate_followers.do_void();
643
644 FastKeepAliveClosure keep_alive(this, &scan_weak_ref);
645 ReferenceProcessor* rp = ref_processor();
646 rp->setup_policy(clear_all_soft_refs);
647 const ReferenceProcessorStats& stats =
648 rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers,
649 NULL, _gc_timer);
650 gc_tracer.report_gc_reference_stats(stats);
651
652 if (!_promotion_failed) {
653 // Swap the survivor spaces.
654 eden()->clear(SpaceDecorator::Mangle);
655 from()->clear(SpaceDecorator::Mangle);
656 if (ZapUnusedHeapArea) {
657 // This is now done here because of the piece-meal mangling which
658 // can check for valid mangling at intermediate points in the
659 // collection(s). When a young collection fails to collect
660 // sufficient space resizing of the young generation can occur
661 // an redistribute the spaces in the young generation. Mangle
662 // here so that unzapped regions don't get distributed to
663 // other spaces.
664 to()->mangle_unused_area();
665 }
666 swap_spaces();
667
668 assert(to()->is_empty(), "to space should be empty now");
669
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