1 /* 2 * Copyright (c) 2017, 2019, 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/g1ConcurrentMarkBitMap.inline.hpp" 29 #include "gc/g1/g1FullCollector.hpp" 30 #include "gc/g1/g1FullGCAdjustTask.hpp" 31 #include "gc/g1/g1FullGCCompactionPoint.hpp" 32 #include "gc/g1/g1FullGCMarker.hpp" 33 #include "gc/g1/g1FullGCOopClosures.inline.hpp" 34 #include "gc/g1/heapRegion.inline.hpp" 35 #include "gc/shared/gcTraceTime.inline.hpp" 36 #include "gc/shared/referenceProcessor.hpp" 37 #include "gc/shared/weakProcessor.inline.hpp" 38 #include "logging/log.hpp" 39 #include "memory/iterator.inline.hpp" 40 #include "runtime/atomic.hpp" 41 42 class G1AdjustLiveClosure : public StackObj { 43 G1AdjustClosure* _adjust_closure; 44 public: 45 G1AdjustLiveClosure(G1AdjustClosure* cl) : 46 _adjust_closure(cl) { } 47 48 size_t apply(oop object) { 49 return object->oop_iterate_size(_adjust_closure); 50 } 51 }; 52 53 class G1AdjustRegionClosure : public HeapRegionClosure { 54 G1CMBitMap* _bitmap; 55 uint _worker_id; 56 public: 57 G1AdjustRegionClosure(G1CMBitMap* bitmap, uint worker_id) : 58 _bitmap(bitmap), 59 _worker_id(worker_id) { } 60 61 bool do_heap_region(HeapRegion* r) { 62 G1AdjustClosure cl; 63 if (r->is_humongous()) { 64 oop obj = oop(r->humongous_start_region()->bottom()); 65 obj->oop_iterate(&cl, MemRegion(r->bottom(), r->top())); 66 } else if (r->is_open_archive()) { 67 // Only adjust the open archive regions, the closed ones 68 // never change. 69 G1AdjustLiveClosure adjust(&cl); 70 r->apply_to_marked_objects(_bitmap, &adjust); 71 // Open archive regions will not be compacted and the marking information is 72 // no longer needed. Clear it here to avoid having to do it later. 73 _bitmap->clear_region(r); 74 } else { 75 G1AdjustLiveClosure adjust(&cl); 76 r->apply_to_marked_objects(_bitmap, &adjust); 77 } 78 return false; 79 } 80 }; 81 82 G1FullGCAdjustTask::G1FullGCAdjustTask(G1FullCollector* collector) : 83 G1FullGCTask("G1 Adjust", collector), 84 _root_processor(G1CollectedHeap::heap(), collector->workers()), 85 _references_done(0), 86 _weak_proc_task(collector->workers()), 87 _hrclaimer(collector->workers()), 88 _adjust(), 89 _string_dedup_cleaning_task(NULL, &_adjust, false) { 90 // Need cleared claim bits for the roots processing 91 ClassLoaderDataGraph::clear_claimed_marks(); 92 } 93 94 void G1FullGCAdjustTask::work(uint worker_id) { 95 Ticks start = Ticks::now(); 96 ResourceMark rm; 97 98 // Adjust preserved marks first since they are not balanced. 99 G1FullGCMarker* marker = collector()->marker(worker_id); 100 marker->preserved_stack()->adjust_during_full_gc(); 101 102 // Adjust the weak roots. 103 104 if (Atomic::add(&_references_done, 1u) == 1u) { // First incr claims task. 105 G1CollectedHeap::heap()->ref_processor_stw()->weak_oops_do(&_adjust); 106 } 107 108 AlwaysTrueClosure always_alive; 109 _weak_proc_task.work(worker_id, &always_alive, &_adjust); 110 111 CLDToOopClosure adjust_cld(&_adjust, ClassLoaderData::_claim_strong); 112 CodeBlobToOopClosure adjust_code(&_adjust, CodeBlobToOopClosure::FixRelocations); 113 _root_processor.process_all_roots(&_adjust, &adjust_cld, &adjust_code); 114 115 // Adjust string dedup data structures. 116 _string_dedup_cleaning_task.work(worker_id); 117 118 // Now adjust pointers region by region 119 G1AdjustRegionClosure blk(collector()->mark_bitmap(), worker_id); 120 G1CollectedHeap::heap()->heap_region_par_iterate_from_worker_offset(&blk, &_hrclaimer, worker_id); 121 log_task("Adjust task", worker_id, start); 122 }