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comparison src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp @ 20337:1f1d373cd044

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8038423: G1: Decommit memory within heap Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps. Reviewed-by: mgerdin, brutisso, jwilhelm
author tschatzl
date Thu, 21 Aug 2014 11:47:10 +0200
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children 7b2fc3129653
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20336:6701abbc4441 20337:1f1d373cd044
1 /*
2 * Copyright (c) 2014, 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_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
27
28 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
29 #include "utilities/debug.hpp"
30
31 class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC {
32 public:
33 // Fired after commit of the memory, i.e. the memory this listener is registered
34 // for can be accessed.
35 virtual void on_commit(uint start_idx, size_t num_regions) = 0;
36 };
37
38 // Maps region based commit/uncommit requests to the underlying page sized virtual
39 // space.
40 class G1RegionToSpaceMapper : public CHeapObj<mtGC> {
41 private:
42 G1MappingChangedListener* _listener;
43 protected:
44 // Backing storage.
45 G1PageBasedVirtualSpace _storage;
46 size_t _commit_granularity;
47 size_t _region_granularity;
48 // Mapping management
49 BitMap _commit_map;
50
51 G1RegionToSpaceMapper(ReservedSpace rs, size_t commit_granularity, size_t region_granularity, MemoryType type);
52
53 void fire_on_commit(uint start_idx, size_t num_regions);
54 public:
55 MemRegion reserved() { return _storage.reserved(); }
56
57 void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; }
58
59 virtual ~G1RegionToSpaceMapper() {
60 _commit_map.resize(0, /* in_resource_area */ false);
61 }
62
63 bool is_committed(uintptr_t idx) const {
64 return _commit_map.at(idx);
65 }
66
67 virtual void commit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
68 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
69
70 // Creates an appropriate G1RegionToSpaceMapper for the given parameters.
71 // The byte_translation_factor defines how many bytes in a region correspond to
72 // a single byte in the data structure this mapper is for.
73 // Eg. in the card table, this value corresponds to the size a single card
74 // table entry corresponds to.
75 static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
76 size_t os_commit_granularity,
77 size_t region_granularity,
78 size_t byte_translation_factor,
79 MemoryType type);
80 };
81
82 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */