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8203232: Shenandoah: Resolve oops in SATB filter

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Reviewed-by: shade
This commit is contained in:
Roman Kennke 2019-02-20 16:29:29 +01:00
parent 2cc6f5951c
commit 96e4678510
4 changed files with 16 additions and 9 deletions
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2
src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.cpp
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@ -335,7 +335,7 @@ void ShenandoahBarrierSet::enqueue(oop obj) {
// Filter marked objects before hitting the SATB queues. The same predicate would
// be used by SATBMQ::filter to eliminate already marked objects downstream, but
// filtering here helps to avoid wasteful SATB queueing work to begin with.
if (!_heap->requires_marking(obj)) return;
if (!_heap->requires_marking<false>(obj)) return;
Thread* thr = Thread::current();
if (thr->is_Java_thread()) {

1
src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp
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@ -676,6 +676,7 @@ public:
void reset_mark_bitmap();
// SATB barriers hooks
template<bool RESOLVE>
inline bool requires_marking(const void* entry) const;
void force_satb_flush_all_threads();

7
src/hotspot/share/gc/shenandoah/shenandoahHeap.inline.hpp
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@ -316,8 +316,13 @@ inline oop ShenandoahHeap::evacuate_object(oop p, Thread* thread) {
}
}
template<bool RESOLVE>
inline bool ShenandoahHeap::requires_marking(const void* entry) const {
return !_marking_context->is_marked(oop(entry));
oop obj = oop(entry);
if (RESOLVE) {
obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
}
return !_marking_context->is_marked(obj);
}
template <class T>

15
src/hotspot/share/gc/shenandoah/shenandoahSATBMarkQueueSet.cpp
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@ -49,12 +49,9 @@ SATBMarkQueue& ShenandoahSATBMarkQueueSet::satb_queue_for_thread(JavaThread* con
return ShenandoahThreadLocalData::satb_mark_queue(t);
}
static inline bool discard_entry(const void* entry, ShenandoahHeap* heap) {
return !heap->requires_marking(entry);
}
template <bool RESOLVE>
class ShenandoahSATBMarkQueueFilterFn {
ShenandoahHeap* _heap;
ShenandoahHeap* const _heap;
public:
ShenandoahSATBMarkQueueFilterFn(ShenandoahHeap* heap) : _heap(heap) {}
@ -62,13 +59,17 @@ public:
// Return true if entry should be filtered out (removed), false if
// it should be retained.
bool operator()(const void* entry) const {
return discard_entry(entry, _heap);
return !_heap->requires_marking<RESOLVE>(entry);
}
};
void ShenandoahSATBMarkQueueSet::filter(SATBMarkQueue* queue) {
assert(_heap != NULL, "SATB queue set not initialized");
apply_filter(ShenandoahSATBMarkQueueFilterFn(_heap), queue);
if (_heap->has_forwarded_objects()) {
apply_filter(ShenandoahSATBMarkQueueFilterFn<true>(_heap), queue);
} else {
apply_filter(ShenandoahSATBMarkQueueFilterFn<false>(_heap), queue);
}
}
bool ShenandoahSATBMarkQueue::should_enqueue_buffer() {