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 "memory/allocation.hpp"
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.
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;
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;
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
83 // table entry corresponds to in the heap.
84 static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
85 size_t actual_size,
86 size_t page_size,
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 */
|
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_G1_G1REGIONTOSPACEMAPPER_HPP
26 #define SHARE_VM_GC_G1_G1REGIONTOSPACEMAPPER_HPP
27
28 #include "gc/g1/g1PageBasedVirtualSpace.hpp"
29 #include "memory/allocation.hpp"
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.
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;
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;
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
83 // table entry corresponds to in the heap.
84 static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
85 size_t actual_size,
86 size_t page_size,
87 size_t region_granularity,
88 size_t byte_translation_factor,
89 MemoryType type);
90 };
91
92 #endif /* SHARE_VM_GC_G1_G1REGIONTOSPACEMAPPER_HPP */
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