Mercurial > hg > graal-jvmci-8
comparison src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 2038:74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
Summary: Age bits need not enter the mark-word preservation calculus; also affected, in addition to CMS, per CR synopsis above, were ParNew (but not DefNew), ParallelScavenge and G1, albeit to a lesser degree than CMS.
Reviewed-by: tonyp, johnc
author | ysr |
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date | Fri, 17 Dec 2010 23:41:31 -0800 |
parents | f95d63e2154a |
children | 92da084fefc9 |
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2037:b03260081e9b | 2038:74ee0db180fa |
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692 // all forwarded headers replaced by the default markOop. This means | 692 // all forwarded headers replaced by the default markOop. This means |
693 // it is not neccessary to preserve most markOops. | 693 // it is not neccessary to preserve most markOops. |
694 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { | 694 void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) { |
695 _promotion_failed = true; | 695 _promotion_failed = true; |
696 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { | 696 if (obj_mark->must_be_preserved_for_promotion_failure(obj)) { |
697 // Should use per-worker private stakcs hetre rather than | |
698 // locking a common pair of stacks. | |
697 ThreadCritical tc; | 699 ThreadCritical tc; |
698 _preserved_oop_stack.push(obj); | 700 _preserved_oop_stack.push(obj); |
699 _preserved_mark_stack.push(obj_mark); | 701 _preserved_mark_stack.push(obj_mark); |
700 } | 702 } |
701 } | 703 } |