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Remove use AtomicAccess for _top if permits

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This commit is contained in:
Xiaolong Peng 2026-01-21 22:06:33 -08:00
parent 07feee5197
commit 1009d847fc
1 changed files with 2 additions and 3 deletions
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5
src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.hpp
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@ -469,12 +469,12 @@ public:
return at == nullptr ? AtomicAccess::load(&_top) : at;
}
assert(!is_atomic_alloc_region(), "Must not be an atomic alloc region");
return AtomicAccess::load(&_top);
return _top;
}
void set_top(HeapWord* v) {
assert(!is_atomic_alloc_region(), "Must not be an atomic alloc region");
AtomicAccess::store(&_top, v);
_top = v;
}
HeapWord* new_top() const { return _new_top; }
@ -583,7 +583,6 @@ public:
while (true /*always break out in the loop*/) {
assert(current_atomic_top != nullptr, "Must not");
AtomicAccess::store(&_top, current_atomic_top); // Sync current _atomic_top back to _top
OrderAccess::fence();
prior_atomic_top = AtomicAccess::cmpxchg(&_atomic_top, current_atomic_top, (HeapWord*) nullptr, memory_order_release);
if (prior_atomic_top == current_atomic_top) {
// break out the loop when successfully exchange _atomic_top to nullptr