Mercurial > hg > graal-jvmci-8
diff src/share/vm/gc_implementation/parNew/parNewGeneration.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 |
---|---|
date | Fri, 17 Dec 2010 23:41:31 -0800 |
parents | f95d63e2154a |
children | 92da084fefc9 |
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--- a/src/share/vm/gc_implementation/parNew/parNewGeneration.cpp Fri Dec 17 11:26:53 2010 -0800 +++ b/src/share/vm/gc_implementation/parNew/parNewGeneration.cpp Fri Dec 17 23:41:31 2010 -0800 @@ -1058,10 +1058,11 @@ #endif void ParNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { - if ((m != markOopDesc::prototype()) && - (!UseBiasedLocking || (m != markOopDesc::biased_locking_prototype()))) { + if (m->must_be_preserved_for_promotion_failure(obj)) { + // We should really have separate per-worker stacks, rather + // than use locking of a common pair of stacks. MutexLocker ml(ParGCRareEvent_lock); - DefNewGeneration::preserve_mark_if_necessary(obj, m); + preserve_mark(obj, m); } }