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comparison src/share/vm/memory/defNewGeneration.cpp @ 453:c96030fff130

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6684579: SoftReference processing can be made more efficient Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not. Reviewed-by: jmasa
author ysr
date Thu, 20 Nov 2008 16:56:09 -0800
parents 1ee8caae33af
children 27a80744a83b
comparison
equal deleted inserted replaced
452:00b023ae2d78 453:c96030fff130
538 gch->rem_set()->prepare_for_younger_refs_iterate(false); 538 gch->rem_set()->prepare_for_younger_refs_iterate(false);
539 539
540 assert(gch->no_allocs_since_save_marks(0), 540 assert(gch->no_allocs_since_save_marks(0),
541 "save marks have not been newly set."); 541 "save marks have not been newly set.");
542 542
543 // Weak refs.
544 // FIXME: Are these storage leaks, or are they resource objects?
545 #ifdef COMPILER2
546 ReferencePolicy *soft_ref_policy = new LRUMaxHeapPolicy();
547 #else
548 ReferencePolicy *soft_ref_policy = new LRUCurrentHeapPolicy();
549 #endif // COMPILER2
550
551 // Not very pretty. 543 // Not very pretty.
552 CollectorPolicy* cp = gch->collector_policy(); 544 CollectorPolicy* cp = gch->collector_policy();
553 545
554 FastScanClosure fsc_with_no_gc_barrier(this, false); 546 FastScanClosure fsc_with_no_gc_barrier(this, false);
555 FastScanClosure fsc_with_gc_barrier(this, true); 547 FastScanClosure fsc_with_gc_barrier(this, true);
572 564
573 // "evacuate followers". 565 // "evacuate followers".
574 evacuate_followers.do_void(); 566 evacuate_followers.do_void();
575 567
576 FastKeepAliveClosure keep_alive(this, &scan_weak_ref); 568 FastKeepAliveClosure keep_alive(this, &scan_weak_ref);
577 ref_processor()->process_discovered_references( 569 ReferenceProcessor* rp = ref_processor();
578 soft_ref_policy, &is_alive, &keep_alive, &evacuate_followers, NULL); 570 rp->snap_policy(clear_all_soft_refs);
571 rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers,
572 NULL);
579 if (!promotion_failed()) { 573 if (!promotion_failed()) {
580 // Swap the survivor spaces. 574 // Swap the survivor spaces.
581 eden()->clear(SpaceDecorator::Mangle); 575 eden()->clear(SpaceDecorator::Mangle);
582 from()->clear(SpaceDecorator::Mangle); 576 from()->clear(SpaceDecorator::Mangle);
583 if (ZapUnusedHeapArea) { 577 if (ZapUnusedHeapArea) {