1 /* 2 * Copyright (c) 2017, 2023, 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 "gc/g1/g1CollectedHeap.inline.hpp" 27 #include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp" 28 #include "gc/g1/g1FullCollector.inline.hpp" 29 #include "gc/g1/g1FullGCCompactionPoint.hpp" 30 #include "gc/g1/g1FullGCMarker.hpp" 31 #include "gc/g1/g1FullGCOopClosures.inline.hpp" 32 #include "gc/g1/g1FullGCPrepareTask.inline.hpp" 33 #include "gc/g1/heapRegion.inline.hpp" 34 #include "gc/shared/gcTraceTime.inline.hpp" 35 #include "gc/shared/referenceProcessor.hpp" 36 #include "logging/log.hpp" 37 #include "memory/iterator.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "utilities/ticks.hpp" 40 41 G1DetermineCompactionQueueClosure::G1DetermineCompactionQueueClosure(G1FullCollector* collector) : 42 _g1h(G1CollectedHeap::heap()), 43 _collector(collector), 44 _cur_worker(0) { } 45 46 bool G1FullGCPrepareTask::G1CalculatePointersClosure::do_heap_region(HeapRegion* hr) { 47 uint region_idx = hr->hrm_index(); 48 assert(_collector->is_compaction_target(region_idx), "must be"); 49 50 assert(!hr->is_pinned(), "must be"); 51 assert(!hr->is_closed_archive(), "must be"); 52 assert(!hr->is_open_archive(), "must be"); 53 54 prepare_for_compaction(hr); 55 56 return false; 57 } 58 59 G1FullGCPrepareTask::G1FullGCPrepareTask(G1FullCollector* collector) : 60 G1FullGCTask("G1 Prepare Compact Task", collector), 61 _has_free_compaction_targets(false), 62 _hrclaimer(collector->workers()) { 63 } 64 65 void G1FullGCPrepareTask::set_has_free_compaction_targets() { 66 if (!_has_free_compaction_targets) { 67 _has_free_compaction_targets = true; 68 } 69 } 70 71 bool G1FullGCPrepareTask::has_free_compaction_targets() { 72 return _has_free_compaction_targets; 73 } 74 75 void G1FullGCPrepareTask::work(uint worker_id) { 76 Ticks start = Ticks::now(); 77 // Calculate the target locations for the objects in the non-free regions of 78 // the compaction queues provided by the associate compaction point. 79 { 80 G1FullGCCompactionPoint* compaction_point = collector()->compaction_point(worker_id); 81 G1CalculatePointersClosure closure(collector(), compaction_point); 82 83 for (GrowableArrayIterator<HeapRegion*> it = compaction_point->regions()->begin(); 84 it != compaction_point->regions()->end(); 85 ++it) { 86 closure.do_heap_region(*it); 87 } 88 compaction_point->update(); 89 // Determine if there are any unused compaction targets. This is only the case if 90 // there are 91 // - any regions in queue, so no free ones either. 92 // - and the current region is not the last one in the list. 93 if (compaction_point->has_regions() && 94 compaction_point->current_region() != compaction_point->regions()->last()) { 95 set_has_free_compaction_targets(); 96 } 97 } 98 log_task("Prepare compaction task", worker_id, start); 99 } 100 101 G1FullGCPrepareTask::G1CalculatePointersClosure::G1CalculatePointersClosure(G1FullCollector* collector, 102 G1FullGCCompactionPoint* cp) : 103 _g1h(G1CollectedHeap::heap()), 104 _collector(collector), 105 _bitmap(collector->mark_bitmap()), 106 _cp(cp) { } 107 108 109 G1FullGCPrepareTask::G1PrepareCompactLiveClosure::G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp) : 110 _cp(cp) { } 111 112 size_t G1FullGCPrepareTask::G1PrepareCompactLiveClosure::apply(oop object) { 113 size_t size = object->size(); 114 _cp->forward(object, size); 115 return size; 116 } 117 118 void G1FullGCPrepareTask::G1CalculatePointersClosure::prepare_for_compaction(HeapRegion* hr) { 119 if (!_collector->is_free(hr->hrm_index())) { 120 G1PrepareCompactLiveClosure prepare_compact(_cp); 121 hr->apply_to_marked_objects(_bitmap, &prepare_compact); 122 } 123 }