1 /* 2 * Copyright (c) 2017, 2018 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.hpp" 27 #include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp" 28 #include "gc/g1/g1FullCollector.hpp" 29 #include "gc/g1/g1FullGCCompactionPoint.hpp" 30 #include "gc/g1/g1FullGCCompactTask.hpp" 31 #include "gc/g1/heapRegion.inline.hpp" 32 #include "gc/shared/gcTraceTime.inline.hpp" 33 #include "logging/log.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "utilities/ticks.inline.hpp" 36 37 class G1ResetHumongousClosure : public HeapRegionClosure { 38 G1CMBitMap* _bitmap; 39 40 public: 41 G1ResetHumongousClosure(G1CMBitMap* bitmap) : 42 _bitmap(bitmap) { } 43 44 bool do_heap_region(HeapRegion* current) { 45 if (current->is_humongous()) { 46 if (current->is_starts_humongous()) { 47 oop obj = oop(current->bottom()); 48 if (_bitmap->is_marked(obj)) { 49 // Clear bitmap and fix mark word. 50 _bitmap->clear(obj); 51 obj->init_mark_raw(); 52 } else { 53 assert(current->is_empty(), "Should have been cleared in phase 2."); 54 } 55 } 56 current->reset_during_compaction(); 57 } 58 return false; 59 } 60 }; 61 62 size_t G1FullGCCompactTask::G1CompactRegionClosure::apply(oop obj) { 63 size_t size = obj->size(); 64 HeapWord* destination = (HeapWord*)obj->forwardee(); 65 if (destination == NULL) { 66 // Object not moving 67 return size; 68 } 69 70 // copy object and reinit its mark 71 HeapWord* obj_addr = (HeapWord*) obj; 72 assert(obj_addr != destination, "everything in this pass should be moving"); 73 Copy::aligned_conjoint_words(obj_addr, destination, size); 74 oop(destination)->init_mark_raw(); 75 assert(oop(destination)->klass() != NULL, "should have a class"); 76 77 return size; 78 } 79 80 void G1FullGCCompactTask::compact_region(HeapRegion* hr) { 81 assert(!hr->is_humongous(), "Should be no humongous regions in compaction queue"); 82 G1CompactRegionClosure compact(collector()->mark_bitmap()); 83 hr->apply_to_marked_objects(collector()->mark_bitmap(), &compact); 84 // Once all objects have been moved the liveness information 85 // needs be cleared. 86 collector()->mark_bitmap()->clear_region(hr); 87 hr->complete_compaction(); 88 } 89 90 void G1FullGCCompactTask::work(uint worker_id) { 91 Ticks start = Ticks::now(); 92 GrowableArray<HeapRegion*>* compaction_queue = collector()->compaction_point(worker_id)->regions(); 93 for (GrowableArrayIterator<HeapRegion*> it = compaction_queue->begin(); 94 it != compaction_queue->end(); 95 ++it) { 96 compact_region(*it); 97 } 98 99 G1ResetHumongousClosure hc(collector()->mark_bitmap()); 100 G1CollectedHeap::heap()->heap_region_par_iterate_from_worker_offset(&hc, &_claimer, worker_id); 101 log_task("Compaction task", worker_id, start); 102 } 103 104 void G1FullGCCompactTask::serial_compaction() { 105 GCTraceTime(Debug, gc, phases) tm("Phase 4: Serial Compaction", collector()->scope()->timer()); 106 GrowableArray<HeapRegion*>* compaction_queue = collector()->serial_compaction_point()->regions(); 107 for (GrowableArrayIterator<HeapRegion*> it = compaction_queue->begin(); 108 it != compaction_queue->end(); 109 ++it) { 110 compact_region(*it); 111 } 112 }