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;
49
50 size_t _region_granularity;
51 // Mapping management
52 CHeapBitMap _commit_map;
53
54 G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, size_t commit_factor, 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
67 bool is_committed(uintptr_t idx) const {
68 return _commit_map.at(idx);
69 }
70
71 virtual void commit_regions(uint start_idx, size_t num_regions = 1) = 0;
72 virtual void uncommit_regions(uint start_idx, size_t num_regions = 1) = 0;
73
74 // Creates an appropriate G1RegionToSpaceMapper for the given parameters.
75 // The actual space to be used within the given reservation is given by actual_size.
76 // This is because some OSes need to round up the reservation size to guarantee
77 // alignment of page_size.
78 // The byte_translation_factor defines how many bytes in a region correspond to
79 // a single byte in the data structure this mapper is for.
80 // Eg. in the card table, this value corresponds to the size a single card
81 // table entry corresponds to in the heap.
82 static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
83 size_t actual_size,
84 size_t page_size,
85 size_t region_granularity,
86 size_t byte_translation_factor,
87 MemoryType type);
88 };
89
90 #endif // SHARE_VM_GC_G1_G1REGIONTOSPACEMAPPER_HPP
|
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 WorkGang;
33
34 class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC {
35 public:
36 // Fired after commit of the memory, i.e. the memory this listener is registered
37 // for can be accessed.
38 // Zero_filled indicates that the memory can be considered as filled with zero bytes
39 // when called.
40 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled) = 0;
41 };
42
43 // Maps region based commit/uncommit requests to the underlying page sized virtual
44 // space.
45 class G1RegionToSpaceMapper : public CHeapObj<mtGC> {
46 private:
47 G1MappingChangedListener* _listener;
48 protected:
49 // Backing storage.
50 G1PageBasedVirtualSpace _storage;
51
52 size_t _region_granularity;
53 // Mapping management
54 CHeapBitMap _commit_map;
55
56 G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, size_t commit_factor, MemoryType type);
57
58 void fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled);
59 public:
60 MemRegion reserved() { return _storage.reserved(); }
61
62 size_t reserved_size() { return _storage.reserved_size(); }
63 size_t committed_size() { return _storage.committed_size(); }
64
65 void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; }
66
67 virtual ~G1RegionToSpaceMapper() {}
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, WorkGang* pretouch_workers = NULL) = 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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