1 /* 2 * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoaderDataGraph.hpp" 27 #include "gc/g1/g1CollectedHeap.hpp" 28 #include "gc/g1/g1FullCollector.hpp" 29 #include "gc/g1/g1FullGCMarker.hpp" 30 #include "gc/g1/g1FullGCMarkTask.hpp" 31 #include "gc/g1/g1FullGCOopClosures.inline.hpp" 32 #include "gc/g1/g1FullGCReferenceProcessorExecutor.hpp" 33 #include "gc/shared/gcTraceTime.inline.hpp" 34 #include "gc/shared/referenceProcessor.hpp" 35 #include "memory/iterator.inline.hpp" 36 37 G1FullGCMarkTask::G1FullGCMarkTask(G1FullCollector* collector) : 38 G1FullGCTask("G1 Parallel Marking Task", collector), 39 _root_processor(G1CollectedHeap::heap(), collector->workers()), 40 _terminator(collector->workers(), collector->array_queue_set()) { 41 // Need cleared claim bits for the roots processing 42 ClassLoaderDataGraph::clear_claimed_marks(); 43 } 44 45 void G1FullGCMarkTask::work(uint worker_id) { 46 Ticks start = Ticks::now(); 47 ResourceMark rm; 48 G1FullGCMarker* marker = collector()->marker(worker_id); 49 MarkingCodeBlobClosure code_closure(marker->mark_closure(), !CodeBlobToOopClosure::FixRelocations); 50 51 if (ClassUnloading) { 52 _root_processor.process_strong_roots(marker->mark_closure(), 53 marker->cld_closure(), 54 &code_closure); 55 } else { 56 _root_processor.process_all_roots(marker->mark_closure(), 57 marker->cld_closure(), 58 &code_closure); 59 } 60 61 // Mark stack is populated, now process and drain it. 62 marker->complete_marking(collector()->oop_queue_set(), collector()->array_queue_set(), &_terminator); 63 64 // This is the point where the entire marking should have completed. 65 assert(marker->oop_stack()->is_empty(), "Marking should have completed"); 66 assert(marker->objarray_stack()->is_empty(), "Array marking should have completed"); 67 log_task("Marking task", worker_id, start); 68 }