186 // GenCollectedHeap heap.
187 void VM_GenCollectFullConcurrent::doit() {
188 assert(Thread::current()->is_VM_thread(), "Should be VM thread");
189 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected");
190
191 GenCollectedHeap* gch = GenCollectedHeap::heap();
192 if (_gc_count_before == gch->total_collections()) {
193 // The "full" of do_full_collection call below "forces"
194 // a collection; the second arg, 0, below ensures that
195 // only the young gen is collected. XXX In the future,
196 // we'll probably need to have something in this interface
197 // to say do this only if we are sure we will not bail
198 // out to a full collection in this attempt, but that's
199 // for the future.
200 assert(SafepointSynchronize::is_at_safepoint(),
201 "We can only be executing this arm of if at a safepoint");
202 GCCauseSetter gccs(gch, _gc_cause);
203 gch->do_full_collection(gch->must_clear_all_soft_refs(), GenCollectedHeap::YoungGen);
204 } // Else no need for a foreground young gc
205 assert((_gc_count_before < gch->total_collections()) ||
206 (GC_locker::is_active() /* gc may have been skipped */
207 && (_gc_count_before == gch->total_collections())),
208 "total_collections() should be monotonically increasing");
209
210 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
211 assert(_full_gc_count_before <= gch->total_full_collections(), "Error");
212 if (gch->total_full_collections() == _full_gc_count_before) {
213 // Nudge the CMS thread to start a concurrent collection.
214 CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause);
215 } else {
216 assert(_full_gc_count_before < gch->total_full_collections(), "Error");
217 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done
218 }
219 }
220
221 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const {
222 Thread* thr = Thread::current();
223 assert(thr != NULL, "Unexpected tid");
224 if (!thr->is_Java_thread()) {
225 assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread");
226 GenCollectedHeap* gch = GenCollectedHeap::heap();
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186 // GenCollectedHeap heap.
187 void VM_GenCollectFullConcurrent::doit() {
188 assert(Thread::current()->is_VM_thread(), "Should be VM thread");
189 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected");
190
191 GenCollectedHeap* gch = GenCollectedHeap::heap();
192 if (_gc_count_before == gch->total_collections()) {
193 // The "full" of do_full_collection call below "forces"
194 // a collection; the second arg, 0, below ensures that
195 // only the young gen is collected. XXX In the future,
196 // we'll probably need to have something in this interface
197 // to say do this only if we are sure we will not bail
198 // out to a full collection in this attempt, but that's
199 // for the future.
200 assert(SafepointSynchronize::is_at_safepoint(),
201 "We can only be executing this arm of if at a safepoint");
202 GCCauseSetter gccs(gch, _gc_cause);
203 gch->do_full_collection(gch->must_clear_all_soft_refs(), GenCollectedHeap::YoungGen);
204 } // Else no need for a foreground young gc
205 assert((_gc_count_before < gch->total_collections()) ||
206 (GCLocker::is_active() /* gc may have been skipped */
207 && (_gc_count_before == gch->total_collections())),
208 "total_collections() should be monotonically increasing");
209
210 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
211 assert(_full_gc_count_before <= gch->total_full_collections(), "Error");
212 if (gch->total_full_collections() == _full_gc_count_before) {
213 // Nudge the CMS thread to start a concurrent collection.
214 CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause);
215 } else {
216 assert(_full_gc_count_before < gch->total_full_collections(), "Error");
217 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done
218 }
219 }
220
221 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const {
222 Thread* thr = Thread::current();
223 assert(thr != NULL, "Unexpected tid");
224 if (!thr->is_Java_thread()) {
225 assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread");
226 GenCollectedHeap* gch = GenCollectedHeap::heap();
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