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8385728: Serial: Check empty MemRegion in maintain_old_to_young_invariant

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Reviewed-by: tschatzl, jsikstro, gli
This commit is contained in:
Albert Mingkun Yang 2026-06-05 14:59:20 +00:00
parent b734700112
commit 0fcf41112c
1 changed files with 11 additions and 2 deletions
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13
src/hotspot/share/gc/serial/cardTableRS.cpp
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@ -49,7 +49,14 @@ void CardTableRS::scan_old_to_young_refs(TenuredGeneration* tg, HeapWord* saved_
void CardTableRS::maintain_old_to_young_invariant(TenuredGeneration* old_gen,
bool is_young_gen_empty) {
if (is_young_gen_empty) {
clear_MemRegion(old_gen->prev_used_region());
MemRegion prev_used_mr = old_gen->prev_used_region();
if (!prev_used_mr.is_empty()) {
clear_MemRegion(prev_used_mr);
}
{
MemRegion old_gen_committed{old_gen->space()->bottom(), old_gen->space()->end()};
verify_region(old_gen_committed, clean_card_val(), true);
}
} else {
MemRegion used_mr = old_gen->used_region();
MemRegion prev_used_mr = old_gen->prev_used_region();
@ -59,7 +66,9 @@ void CardTableRS::maintain_old_to_young_invariant(TenuredGeneration* old_gen,
}
// No idea which card contains old-to-young pointer, so dirtying cards for
// the entire used part of old-gen conservatively.
dirty_MemRegion(used_mr);
if (!used_mr.is_empty()) {
dirty_MemRegion(used_mr);
}
}
}