Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp @ 23660:b5f3a471e646
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 01 Jun 2016 00:11:44 +0200 |
parents | e5406a79ae90 |
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rev | line source |
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20337 | 1 /* |
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2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. |
20337 | 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" | |
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29 #include "memory/allocation.hpp" |
20337 | 30 #include "utilities/debug.hpp" |
31 | |
32 class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC { | |
33 public: | |
34 // Fired after commit of the memory, i.e. the memory this listener is registered | |
35 // for can be accessed. | |
20543 | 36 // Zero_filled indicates that the memory can be considered as filled with zero bytes |
37 // when called. | |
38 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled) = 0; | |
20337 | 39 }; |
40 | |
41 // Maps region based commit/uncommit requests to the underlying page sized virtual | |
42 // space. | |
43 class G1RegionToSpaceMapper : public CHeapObj<mtGC> { | |
44 private: | |
45 G1MappingChangedListener* _listener; | |
46 protected: | |
47 // Backing storage. | |
48 G1PageBasedVirtualSpace _storage; | |
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49 |
20337 | 50 size_t _region_granularity; |
51 // Mapping management | |
52 BitMap _commit_map; | |
53 | |
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54 G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, MemoryType type); |
20337 | 55 |
20543 | 56 void fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
20337 | 57 public: |
58 MemRegion reserved() { return _storage.reserved(); } | |
59 | |
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60 size_t reserved_size() { return _storage.reserved_size(); } |
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61 size_t committed_size() { return _storage.committed_size(); } |
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62 |
20337 | 63 void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; } |
64 | |
65 virtual ~G1RegionToSpaceMapper() { | |
66 _commit_map.resize(0, /* in_resource_area */ false); | |
67 } | |
68 | |
69 bool is_committed(uintptr_t idx) const { | |
70 return _commit_map.at(idx); | |
71 } | |
72 | |
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73 virtual void commit_regions(uint start_idx, size_t num_regions = 1) = 0; |
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74 virtual void uncommit_regions(uint start_idx, size_t num_regions = 1) = 0; |
20337 | 75 |
76 // Creates an appropriate G1RegionToSpaceMapper for the given parameters. | |
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77 // The actual space to be used within the given reservation is given by actual_size. |
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78 // This is because some OSes need to round up the reservation size to guarantee |
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79 // alignment of page_size. |
20337 | 80 // The byte_translation_factor defines how many bytes in a region correspond to |
81 // a single byte in the data structure this mapper is for. | |
82 // Eg. in the card table, this value corresponds to the size a single card | |
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83 // table entry corresponds to in the heap. |
20337 | 84 static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs, |
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85 size_t actual_size, |
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86 size_t page_size, |
20337 | 87 size_t region_granularity, |
88 size_t byte_translation_factor, | |
89 MemoryType type); | |
90 }; | |
91 | |
92 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */ |