| /* |
| * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_G1_G1REGIONTOSPACEMAPPER_HPP |
| #define SHARE_VM_GC_G1_G1REGIONTOSPACEMAPPER_HPP |
| |
| #include "gc/g1/g1PageBasedVirtualSpace.hpp" |
| #include "memory/allocation.hpp" |
| #include "utilities/debug.hpp" |
| |
| class WorkGang; |
| |
| class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC { |
| public: |
| // Fired after commit of the memory, i.e. the memory this listener is registered |
| // for can be accessed. |
| // Zero_filled indicates that the memory can be considered as filled with zero bytes |
| // when called. |
| virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled) = 0; |
| }; |
| |
| // Maps region based commit/uncommit requests to the underlying page sized virtual |
| // space. |
| class G1RegionToSpaceMapper : public CHeapObj<mtGC> { |
| private: |
| G1MappingChangedListener* _listener; |
| protected: |
| // Backing storage. |
| G1PageBasedVirtualSpace _storage; |
| |
| size_t _region_granularity; |
| // Mapping management |
| CHeapBitMap _commit_map; |
| |
| G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, size_t commit_factor, MemoryType type); |
| |
| void fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
| public: |
| MemRegion reserved() { return _storage.reserved(); } |
| |
| size_t reserved_size() { return _storage.reserved_size(); } |
| size_t committed_size() { return _storage.committed_size(); } |
| |
| void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; } |
| |
| virtual ~G1RegionToSpaceMapper() {} |
| |
| bool is_committed(uintptr_t idx) const { |
| return _commit_map.at(idx); |
| } |
| |
| virtual void commit_regions(uint start_idx, size_t num_regions = 1, WorkGang* pretouch_workers = NULL) = 0; |
| virtual void uncommit_regions(uint start_idx, size_t num_regions = 1) = 0; |
| |
| // Creates an appropriate G1RegionToSpaceMapper for the given parameters. |
| // The actual space to be used within the given reservation is given by actual_size. |
| // This is because some OSes need to round up the reservation size to guarantee |
| // alignment of page_size. |
| // The byte_translation_factor defines how many bytes in a region correspond to |
| // a single byte in the data structure this mapper is for. |
| // Eg. in the card table, this value corresponds to the size a single card |
| // table entry corresponds to in the heap. |
| static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs, |
| size_t actual_size, |
| size_t page_size, |
| size_t region_granularity, |
| size_t byte_translation_factor, |
| MemoryType type); |
| }; |
| |
| #endif // SHARE_VM_GC_G1_G1REGIONTOSPACEMAPPER_HPP |