181 }
182
183 // VM operation to invoke a concurrent collection of a
184 // GenCollectedHeap heap.
185 void VM_GenCollectFullConcurrent::doit() {
186 assert(Thread::current()->is_VM_thread(), "Should be VM thread");
187 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected");
188
189 GenCollectedHeap* gch = GenCollectedHeap::heap();
190 if (_gc_count_before == gch->total_collections()) {
191 // The "full" of do_full_collection call below "forces"
192 // a collection; the second arg, 0, below ensures that
193 // only the young gen is collected. XXX In the future,
194 // we'll probably need to have something in this interface
195 // to say do this only if we are sure we will not bail
196 // out to a full collection in this attempt, but that's
197 // for the future.
198 assert(SafepointSynchronize::is_at_safepoint(),
199 "We can only be executing this arm of if at a safepoint");
200 GCCauseSetter gccs(gch, _gc_cause);
201 gch->do_full_collection(gch->must_clear_all_soft_refs(),
202 0 /* collect only youngest gen */);
203 } // Else no need for a foreground young gc
204 assert((_gc_count_before < gch->total_collections()) ||
205 (GC_locker::is_active() /* gc may have been skipped */
206 && (_gc_count_before == gch->total_collections())),
207 "total_collections() should be monotonically increasing");
208
209 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
210 assert(_full_gc_count_before <= gch->total_full_collections(), "Error");
211 if (gch->total_full_collections() == _full_gc_count_before) {
212 // Nudge the CMS thread to start a concurrent collection.
213 CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause);
214 } else {
215 assert(_full_gc_count_before < gch->total_full_collections(), "Error");
216 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done
217 }
218 }
219
220 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const {
221 Thread* thr = Thread::current();
222 assert(thr != NULL, "Unexpected tid");
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181 }
182
183 // VM operation to invoke a concurrent collection of a
184 // GenCollectedHeap heap.
185 void VM_GenCollectFullConcurrent::doit() {
186 assert(Thread::current()->is_VM_thread(), "Should be VM thread");
187 assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected");
188
189 GenCollectedHeap* gch = GenCollectedHeap::heap();
190 if (_gc_count_before == gch->total_collections()) {
191 // The "full" of do_full_collection call below "forces"
192 // a collection; the second arg, 0, below ensures that
193 // only the young gen is collected. XXX In the future,
194 // we'll probably need to have something in this interface
195 // to say do this only if we are sure we will not bail
196 // out to a full collection in this attempt, but that's
197 // for the future.
198 assert(SafepointSynchronize::is_at_safepoint(),
199 "We can only be executing this arm of if at a safepoint");
200 GCCauseSetter gccs(gch, _gc_cause);
201 gch->do_full_collection(gch->must_clear_all_soft_refs(), Generation::Young);
202 } // Else no need for a foreground young gc
203 assert((_gc_count_before < gch->total_collections()) ||
204 (GC_locker::is_active() /* gc may have been skipped */
205 && (_gc_count_before == gch->total_collections())),
206 "total_collections() should be monotonically increasing");
207
208 MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
209 assert(_full_gc_count_before <= gch->total_full_collections(), "Error");
210 if (gch->total_full_collections() == _full_gc_count_before) {
211 // Nudge the CMS thread to start a concurrent collection.
212 CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause);
213 } else {
214 assert(_full_gc_count_before < gch->total_full_collections(), "Error");
215 FullGCCount_lock->notify_all(); // Inform the Java thread its work is done
216 }
217 }
218
219 bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const {
220 Thread* thr = Thread::current();
221 assert(thr != NULL, "Unexpected tid");
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