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8062943: REDO - Parallelize clearing the next mark bitmap

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Reviewed-by: kbarrett, tschatzl
This commit is contained in:
Marcus Larsson 2014-11-25 11:59:55 +01:00
parent 561b51f5ce
commit 89dca54c74
6 changed files with 44 additions and 11 deletions
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12
hotspot/src/share/vm/gc_implementation/g1/heapRegionManager.cpp
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@ -260,7 +260,7 @@ uint HeapRegionManager::find_unavailable_from_idx(uint start_idx, uint* res_idx)
return num_regions;
}
void HeapRegionManager::par_iterate(HeapRegionClosure* blk, uint worker_id, HeapRegionClaimer* hrclaimer) const {
void HeapRegionManager::par_iterate(HeapRegionClosure* blk, uint worker_id, HeapRegionClaimer* hrclaimer, bool concurrent) const {
const uint start_index = hrclaimer->start_region_for_worker(worker_id);
// Every worker will actually look at all regions, skipping over regions that
@ -279,7 +279,11 @@ void HeapRegionManager::par_iterate(HeapRegionClosure* blk, uint worker_id, Heap
// We'll ignore "continues humongous" regions (we'll process them
// when we come across their corresponding "start humongous"
// region) and regions already claimed.
if (hrclaimer->is_region_claimed(index) || r->is_continues_humongous()) {
// However, if the iteration is specified as concurrent, the values for
// is_starts_humongous and is_continues_humongous can not be trusted,
// and we should just blindly iterate over regions regardless of their
// humongous status.
if (hrclaimer->is_region_claimed(index) || (!concurrent && r->is_continues_humongous())) {
continue;
}
// OK, try to claim it
@ -287,7 +291,9 @@ void HeapRegionManager::par_iterate(HeapRegionClosure* blk, uint worker_id, Heap
continue;
}
// Success!
if (r->is_starts_humongous()) {
// As mentioned above, special treatment of humongous regions can only be
// done if we are iterating non-concurrently.
if (!concurrent && r->is_starts_humongous()) {
// If the region is "starts humongous" we'll iterate over its
// "continues humongous" first; in fact we'll do them
// first. The order is important. In one case, calling the