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 *
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;
49
50 size_t _region_granularity;
51 // Mapping management
52 BitMap _commit_map;
53
54 G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, MemoryType type);
55
56 void fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled);
57 public:
58 MemRegion reserved() { return _storage.reserved(); }
59
60 void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; }
61
62 virtual ~G1RegionToSpaceMapper() {
63 _commit_map.resize(0, /* in_resource_area */ false);
64 }
65
66 bool is_committed(uintptr_t idx) const {
67 return _commit_map.at(idx);
68 }
69
70 virtual void commit_regions(uint start_idx, size_t num_regions = 1) = 0;
71 virtual void uncommit_regions(uint start_idx, size_t num_regions = 1) = 0;
72
73 // Creates an appropriate G1RegionToSpaceMapper for the given parameters.
74 // The actual space to be used within the given reservation is given by actual_size.
75 // This is because some OSes need to round up the reservation size to guarantee
76 // alignment of page_size.
77 // The byte_translation_factor defines how many bytes in a region correspond to
78 // a single byte in the data structure this mapper is for.
79 // Eg. in the card table, this value corresponds to the size a single card
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1 /*
2 * Copyright (c) 2014, 2015, 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 *
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;
49
50 size_t _region_granularity;
51 // Mapping management
52 BitMap _commit_map;
53
54 G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, MemoryType type);
55
56 void fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled);
57 public:
58 MemRegion reserved() { return _storage.reserved(); }
59
60 size_t reserved_size() { return _storage.reserved_size(); }
61 size_t committed_size() { return _storage.committed_size(); }
62
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
73 virtual void commit_regions(uint start_idx, size_t num_regions = 1) = 0;
74 virtual void uncommit_regions(uint start_idx, size_t num_regions = 1) = 0;
75
76 // Creates an appropriate G1RegionToSpaceMapper for the given parameters.
77 // The actual space to be used within the given reservation is given by actual_size.
78 // This is because some OSes need to round up the reservation size to guarantee
79 // alignment of page_size.
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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