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8371284: GenShen: Avoid unnecessary card marking

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Reviewed-by: wkemper, shade, ysr
This commit is contained in:
Nityanand Rai 2025-12-18 21:15:44 +00:00 committed by Paul Hohensee
parent 6cbfc7691f
commit 8a93658e87
1 changed files with 14 additions and 0 deletions
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14
src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.inline.hpp
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@ -191,6 +191,20 @@ inline void ShenandoahBarrierSet::keep_alive_if_weak(DecoratorSet decorators, oo
template <DecoratorSet decorators, typename T>
inline void ShenandoahBarrierSet::write_ref_field_post(T* field) {
assert(ShenandoahCardBarrier, "Should have been checked by caller");
if (_heap->is_in_young(field)) {
// Young field stores do not require card mark.
return;
}
T heap_oop = RawAccess<>::oop_load(field);
if (CompressedOops::is_null(heap_oop)) {
// Null reference store do not require card mark.
return;
}
oop obj = CompressedOops::decode_not_null(heap_oop);
if (!_heap->is_in_young(obj)) {
// Not an old->young reference store.
return;
}
volatile CardTable::CardValue* byte = card_table()->byte_for(field);
*byte = CardTable::dirty_card_val();
}