Mercurial > hg > truffle

comparison src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp @ 453:c96030fff130

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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 eb28cf662f56
children 27a80744a83b
comparison
equal deleted inserted replaced
452:00b023ae2d78 453:c96030fff130
170 170
171 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); 171 NOT_PRODUCT(ref_processor()->verify_no_references_recorded());
172 COMPILER2_PRESENT(DerivedPointerTable::clear()); 172 COMPILER2_PRESENT(DerivedPointerTable::clear());
173 173
174 ref_processor()->enable_discovery(); 174 ref_processor()->enable_discovery();
175 ref_processor()->snap_policy(clear_all_softrefs);
175 176
176 mark_sweep_phase1(clear_all_softrefs); 177 mark_sweep_phase1(clear_all_softrefs);
177 178
178 mark_sweep_phase2(); 179 mark_sweep_phase2();
179 180
515 // Flush marking stack. 516 // Flush marking stack.
516 follow_stack(); 517 follow_stack();
517 518
518 // Process reference objects found during marking 519 // Process reference objects found during marking
519 { 520 {
520 ReferencePolicy *soft_ref_policy; 521 ref_processor()->snap_policy(clear_all_softrefs);
521 if (clear_all_softrefs) {
522 soft_ref_policy = new AlwaysClearPolicy();
523 } else {
524 #ifdef COMPILER2
525 soft_ref_policy = new LRUMaxHeapPolicy();
526 #else
527 soft_ref_policy = new LRUCurrentHeapPolicy();
528 #endif // COMPILER2
529 }
530 assert(soft_ref_policy != NULL,"No soft reference policy");
531 ref_processor()->process_discovered_references( 522 ref_processor()->process_discovered_references(
532 soft_ref_policy, is_alive_closure(), mark_and_push_closure(), 523 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL);
533 follow_stack_closure(), NULL);
534 } 524 }
535 525
536 // Follow system dictionary roots and unload classes 526 // Follow system dictionary roots and unload classes
537 bool purged_class = SystemDictionary::do_unloading(is_alive_closure()); 527 bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
538 528