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