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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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7
hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
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@ -3958,8 +3958,6 @@ void G1CollectedHeap::remove_self_forwarding_pointers() {
// Now restore saved marks, if any.
if (_objs_with_preserved_marks != NULL) {
assert(_preserved_marks_of_objs != NULL, "Both or none.");
assert(_objs_with_preserved_marks->length() ==
_preserved_marks_of_objs->length(), "Both or none.");
guarantee(_objs_with_preserved_marks->length() ==
_preserved_marks_of_objs->length(), "Both or none.");
for (int i = 0; i < _objs_with_preserved_marks->length(); i++) {
@ -4054,7 +4052,10 @@ void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) {
}
void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) {
if (m != markOopDesc::prototype()) {
assert(evacuation_failed(), "Oversaving!");
// We want to call the "for_promotion_failure" version only in the
// case of a promotion failure.
if (m->must_be_preserved_for_promotion_failure(obj)) {
if (_objs_with_preserved_marks == NULL) {
assert(_preserved_marks_of_objs == NULL, "Both or none.");
_objs_with_preserved_marks =