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8308752: Generational ZGC: Avoid final marking through stack chunks

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Reviewed-by: stefank, aboldtch
This commit is contained in:
Erik Österlund 2023-06-02 06:54:20 +00:00
parent 7b0a33600e
commit 8f1ce78907
1 changed files with 10 additions and 9 deletions
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19
src/hotspot/share/gc/z/zMark.cpp
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@ -375,16 +375,17 @@ void ZMark::follow_array_object(objArrayOop obj, bool finalizable) {
void ZMark::follow_object(oop obj, bool finalizable) {
if (_generation->is_old()) {
if (ZHeap::heap()->is_old(to_zaddress(obj))) {
if (finalizable) {
ZMarkBarrierFollowOopClosure<true /* finalizable */, ZGenerationIdOptional::old> cl;
ZIterator::oop_iterate(obj, &cl);
} else {
ZMarkBarrierFollowOopClosure<false /* finalizable */, ZGenerationIdOptional::old> cl;
ZIterator::oop_iterate(obj, &cl);
}
assert(ZHeap::heap()->is_old(to_zaddress(obj)), "Should only follow objects from old gen");
if (obj->is_stackChunk()) {
// No support for tracing through stack chunks as finalizably reachable
ZMarkBarrierFollowOopClosure<false /* finalizable */, ZGenerationIdOptional::old> cl;
ZIterator::oop_iterate(obj, &cl);
} else if (finalizable) {
ZMarkBarrierFollowOopClosure<true /* finalizable */, ZGenerationIdOptional::old> cl;
ZIterator::oop_iterate(obj, &cl);
} else {
fatal("Catch me!");
ZMarkBarrierFollowOopClosure<false /* finalizable */, ZGenerationIdOptional::old> cl;
ZIterator::oop_iterate(obj, &cl);
}
} else {
// Young gen must help out with old marking