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6807801: CMS: could save/restore fewer header words during scavenge

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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
This commit is contained in:
Y. Srinivas Ramakrishna 2010-12-17 23:41:31 -08:00
parent b2fa4708ad
commit 41bf31bff4
6 changed files with 37 additions and 21 deletions
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2
hotspot/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp
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@ -694,6 +694,8 @@ void PSScavenge::clean_up_failed_promotion() {
void PSScavenge::oop_promotion_failed(oop obj, markOop obj_mark) {
_promotion_failed = true;
if (obj_mark->must_be_preserved_for_promotion_failure(obj)) {
// Should use per-worker private stakcs hetre rather than
// locking a common pair of stacks.
ThreadCritical tc;
_preserved_oop_stack.push(obj);
_preserved_mark_stack.push(obj_mark);