1 /* 2 * Copyright (c) 2017, 2022, 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 #ifndef SHARE_GC_G1_G1FULLGCPREPARETASK_HPP 26 #define SHARE_GC_G1_G1FULLGCPREPARETASK_HPP 27 28 #include "gc/g1/g1FullGCTask.hpp" 29 #include "gc/g1/heapRegion.hpp" 30 #include "memory/allocation.hpp" 31 32 class G1CollectedHeap; 33 class G1CMBitMap; 34 class G1FullCollector; 35 class G1FullGCCompactionPoint; 36 class HeapRegion; 37 38 // Determines the regions in the heap that should be part of the compaction and 39 // distributes them among the compaction queues in round-robin fashion. 40 class G1DetermineCompactionQueueClosure : public HeapRegionClosure { 41 G1CollectedHeap* _g1h; 42 G1FullCollector* _collector; 43 uint _cur_worker; 44 45 template<bool is_humongous> 46 inline void free_pinned_region(HeapRegion* hr); 47 48 inline bool should_compact(HeapRegion* hr) const; 49 50 // Returns the current worker id to assign a compaction point to, and selects 51 // the next one round-robin style. 52 inline uint next_worker(); 53 54 inline G1FullGCCompactionPoint* next_compaction_point(); 55 56 inline void add_to_compaction_queue(HeapRegion* hr); 57 58 public: 59 G1DetermineCompactionQueueClosure(G1FullCollector* collector); 60 61 inline bool do_heap_region(HeapRegion* hr) override; 62 }; 63 64 class G1FullGCPrepareTask : public G1FullGCTask { 65 volatile bool _has_free_compaction_targets; 66 HeapRegionClaimer _hrclaimer; 67 68 void set_has_free_compaction_targets(); 69 70 public: 71 G1FullGCPrepareTask(G1FullCollector* collector); 72 void work(uint worker_id); 73 // After the Prepare phase, are there any unused (empty) regions (compaction 74 // targets) at the end of any compaction queues? 75 bool has_free_compaction_targets(); 76 77 private: 78 class G1CalculatePointersClosure : public HeapRegionClosure { 79 G1CollectedHeap* _g1h; 80 G1FullCollector* _collector; 81 G1CMBitMap* _bitmap; 82 G1FullGCCompactionPoint* _cp; 83 84 void prepare_for_compaction(HeapRegion* hr); 85 86 public: 87 G1CalculatePointersClosure(G1FullCollector* collector, 88 G1FullGCCompactionPoint* cp); 89 90 bool do_heap_region(HeapRegion* hr); 91 }; 92 93 class G1ResetMetadataClosure : public HeapRegionClosure { 94 G1CollectedHeap* _g1h; 95 G1FullCollector* _collector; 96 97 void reset_region_metadata(HeapRegion* hr); 98 // Scrub all runs of dead objects within the given region by putting filler 99 // objects and updating the corresponding BOT. If update_bot_for_live is true, 100 // also update the BOT for live objects. 101 void scrub_skip_compacting_region(HeapRegion* hr, bool update_bot_for_live); 102 103 public: 104 G1ResetMetadataClosure(G1FullCollector* collector); 105 106 bool do_heap_region(HeapRegion* hr); 107 }; 108 109 class G1PrepareCompactLiveClosure : public StackObj { 110 G1FullGCCompactionPoint* _cp; 111 112 public: 113 G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp); 114 size_t apply(oop object); 115 }; 116 }; 117 118 // Closure to re-prepare objects in the serial compaction point queue regions for 119 // serial compaction. 120 class G1SerialRePrepareClosure : public StackObj { 121 G1FullGCCompactionPoint* _cp; 122 HeapRegion* _current; 123 124 public: 125 G1SerialRePrepareClosure(G1FullGCCompactionPoint* hrcp, HeapRegion* hr) : 126 _cp(hrcp), 127 _current(hr) { } 128 129 inline size_t apply(oop obj); 130 }; 131 132 #endif // SHARE_GC_G1_G1FULLGCPREPARETASK_HPP