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8062836: BACKOUT - Parallelize clearing the next mark bitmap

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Backing out due to non-trivial issues found in nightly testing

Reviewed-by: mgerdin, mlarsson
This commit is contained in:
Jesper Wilhelmsson 2014-11-05 15:50:14 +01:00
parent 0e54928686
commit 7339456266
2 changed files with 3 additions and 26 deletions
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28
hotspot/src/share/vm/gc_implementation/g1/concurrentMark.cpp
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@ -180,32 +180,9 @@ class ClearBitmapHRClosure : public HeapRegionClosure {
}
};
class ParClearNextMarkBitmapTask : public AbstractGangTask {
ClearBitmapHRClosure* _cl;
HeapRegionClaimer _hrclaimer;
bool _suspendible; // If the task is suspendible, workers must join the STS.
public:
ParClearNextMarkBitmapTask(ClearBitmapHRClosure *cl, uint n_workers, bool suspendible) :
_cl(cl), _suspendible(suspendible), AbstractGangTask("Parallel Clear Bitmap Task"), _hrclaimer(n_workers) {}
void work(uint worker_id) {
if (_suspendible) {
SuspendibleThreadSet::join();
}
G1CollectedHeap::heap()->heap_region_par_iterate(_cl, worker_id, &_hrclaimer);
if (_suspendible) {
SuspendibleThreadSet::leave();
}
}
};
void CMBitMap::clearAll() {
G1CollectedHeap* g1h = G1CollectedHeap::heap();
ClearBitmapHRClosure cl(NULL, this, false /* may_yield */);
uint n_workers = g1h->workers()->active_workers();
ParClearNextMarkBitmapTask task(&cl, n_workers, false);
g1h->workers()->run_task(&task);
G1CollectedHeap::heap()->heap_region_iterate(&cl);
guarantee(cl.complete(), "Must have completed iteration.");
return;
}
@ -884,8 +861,7 @@ void ConcurrentMark::clearNextBitmap() {
guarantee(!g1h->mark_in_progress(), "invariant");
ClearBitmapHRClosure cl(this, _nextMarkBitMap, true /* may_yield */);
ParClearNextMarkBitmapTask task(&cl, parallel_marking_threads(), true);
_parallel_workers->run_task(&task);
g1h->heap_region_iterate(&cl);
// Clear the liveness counting data. If the marking has been aborted, the abort()
// call already did that.

1
hotspot/src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp
View File

@ -280,6 +280,7 @@ void ConcurrentMarkThread::run() {
// We may have aborted just before the remark. Do not bother clearing the
// bitmap then, as it has been done during mark abort.
if (!cm()->has_aborted()) {
SuspendibleThreadSetJoiner sts;
_cm->clearNextBitmap();
} else {
assert(!G1VerifyBitmaps || _cm->nextMarkBitmapIsClear(), "Next mark bitmap must be clear");