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.
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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 SlidingForwarding;
36 class G1FullGCCompactionPoint;
37 class HeapRegion;
38
39 // Determines the regions in the heap that should be part of the compaction and
40 // distributes them among the compaction queues in round-robin fashion.
41 class G1DetermineCompactionQueueClosure : public HeapRegionClosure {
42 G1CollectedHeap* _g1h;
43 G1FullCollector* _collector;
44 uint _cur_worker;
45
46 template<bool is_humongous>
47 inline void free_pinned_region(HeapRegion* hr);
48
49 inline bool should_compact(HeapRegion* hr) const;
50
51 // Returns the current worker id to assign a compaction point to, and selects
52 // the next one round-robin style.
53 inline uint next_worker();
54
55 inline G1FullGCCompactionPoint* next_compaction_point();
56
57 inline void add_to_compaction_queue(HeapRegion* hr);
58
59 public:
60 G1DetermineCompactionQueueClosure(G1FullCollector* collector);
61
62 inline bool do_heap_region(HeapRegion* hr) override;
63 };
64
65 class G1FullGCPrepareTask : public G1FullGCTask {
66 volatile bool _has_free_compaction_targets;
67 HeapRegionClaimer _hrclaimer;
68
69 void set_has_free_compaction_targets();
70
71 public:
72 G1FullGCPrepareTask(G1FullCollector* collector);
73 void work(uint worker_id);
74 // After the Prepare phase, are there any unused (empty) regions (compaction
75 // targets) at the end of any compaction queues?
76 bool has_free_compaction_targets();
77
78 private:
79 class G1CalculatePointersClosure : public HeapRegionClosure {
80 G1CollectedHeap* _g1h;
81 G1FullCollector* _collector;
82 G1CMBitMap* _bitmap;
83 G1FullGCCompactionPoint* _cp;
84
85 void prepare_for_compaction(HeapRegion* hr);
86
87 public:
88 G1CalculatePointersClosure(G1FullCollector* collector,
89 G1FullGCCompactionPoint* cp);
90
91 bool do_heap_region(HeapRegion* hr);
92 };
93
94 class G1PrepareCompactLiveClosure : public StackObj {
95 G1FullGCCompactionPoint* _cp;
96 SlidingForwarding* const _forwarding;
97
98 public:
99 G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp);
100 size_t apply(oop object);
101 };
102 };
103
104 // Closure to re-prepare objects in the serial compaction point queue regions for
105 // serial compaction.
106 //class G1SerialRePrepareClosure : public StackObj {
107 // G1FullGCCompactionPoint* _cp;
108 // HeapWord* _dense_prefix_top;
109 //
110 //public:
111 // G1SerialRePrepareClosure(G1FullGCCompactionPoint* hrcp, HeapWord* dense_prefix_top) :
112 // _cp(hrcp),
113 // _dense_prefix_top(dense_prefix_top) { }
114 //
115 // inline size_t apply(oop obj);
116 //};
117
118 #endif // SHARE_GC_G1_G1FULLGCPREPARETASK_HPP