Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp @ 20337:1f1d373cd044
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 |
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date | Thu, 21 Aug 2014 11:47:10 +0200 |
parents | |
children | 7b2fc3129653 |
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20336:6701abbc4441 | 20337:1f1d373cd044 |
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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 */ |