// VM operation to invoke a concurrent collection of a
// GenCollectedHeap heap.
void VM_GenCollectFullConcurrent::doit() {
assert(Thread::current()->is_VM_thread(), "Should be VM thread");
assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected");
GenCollectedHeap* gch = GenCollectedHeap::heap();
if (_gc_count_before == gch->total_collections()) {
// The "full" of do_full_collection call below "forces"
// a collection; the second arg, 0, below ensures that
// only the young gen is collected. XXX In the future,
// we'll probably need to have something in this interface
// to say do this only if we are sure we will not bail
// out to a full collection in this attempt, but that's
// for the future.
assert(SafepointSynchronize::is_at_safepoint(),
"We can only be executing this arm of if at a safepoint");
GCCauseSetter gccs(gch, _gc_cause);
gch->do_full_collection(gch->must_clear_all_soft_refs(), GenCollectedHeap::YoungGen);
} // Else no need for a foreground young gc
assert((_gc_count_before < gch->total_collections()) ||
(GCLocker::is_active() /* gc may have been skipped */
&& (_gc_count_before == gch->total_collections())),
"total_collections() should be monotonically increasing");
MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
assert(_full_gc_count_before <= gch->total_full_collections(), "Error");
if (gch->total_full_collections() == _full_gc_count_before) {
// Nudge the CMS thread to start a concurrent collection.
CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause);
} else {
assert(_full_gc_count_before < gch->total_full_collections(), "Error");
FullGCCount_lock->notify_all(); // Inform the Java thread its work is done
}
}
void VM_GenCollectFull::doit() {
SvcGCMarker sgcm(SvcGCMarker::FULL);
GenCollectedHeap* gch = GenCollectedHeap::heap();
GCCauseSetter gccs(gch, _gc_cause);
gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level);
}
void VM_GenCollectForPermanentAllocation::doit() {
SvcGCMarker sgcm(SvcGCMarker::FULL);
SharedHeap* heap = (SharedHeap*)Universe::heap();
GCCauseSetter gccs(heap, _gc_cause);
switch (heap->kind()) {
case (CollectedHeap::GenCollectedHeap): {
GenCollectedHeap* gch = (GenCollectedHeap*)heap;
gch->do_full_collection(gch->must_clear_all_soft_refs(),
gch->n_gens() - 1);
break;
}
#ifndef SERIALGC
case (CollectedHeap::G1CollectedHeap): {
G1CollectedHeap* g1h = (G1CollectedHeap*)heap;
g1h->do_full_collection(_gc_cause == GCCause::_last_ditch_collection);
break;
}
#endif // SERIALGC
default:
ShouldNotReachHere();
}
_res = heap->perm_gen()->allocate(_size, false);
assert(heap->is_in_reserved_or_null(_res), "result not in heap");
if (_res == NULL && GC_locker::is_active_and_needs_gc()) {
set_gc_locked();
}
}