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.
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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