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diff src/share/vm/gc_implementation/parNew/parNewGeneration.cpp @ 2038:74ee0db180fa

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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
line wrap: on
line diff
--- 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);
   }
 }