author | tschatzl |
Sat, 18 May 2019 22:11:25 +0200 | |
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parent 54264 | 41af8d0546bc |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 2019, 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_GC_G1_G1REGIONTOSPACEMAPPER_HPP |
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#define SHARE_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 WorkGang; |
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class G1MappingChangedListener { |
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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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CHeapBitMap _commit_map; |
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G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, size_t commit_factor, 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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bool is_committed(uintptr_t idx) const { |
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return _commit_map.at(idx); |
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} |
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void commit_and_set_special(); |
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virtual void commit_regions(uint start_idx, size_t num_regions = 1, WorkGang* pretouch_workers = NULL) = 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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static G1RegionToSpaceMapper* create_heap_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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// G1RegionToSpaceMapper implementation where |
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// part of space is mapped to dram and part to nv-dimm |
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class G1RegionToHeteroSpaceMapper : public G1RegionToSpaceMapper { |
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private: |
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ReservedSpace _rs; |
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G1RegionToSpaceMapper* _dram_mapper; |
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uint _num_committed_dram; |
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uint _num_committed_nvdimm; |
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uint _start_index_of_dram; |
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size_t _page_size; |
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size_t _commit_factor; |
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MemoryType _type; |
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public: |
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G1RegionToHeteroSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, size_t commit_factor, MemoryType type); |
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bool initialize(); |
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uint num_committed_dram() const; |
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uint num_committed_nvdimm() const; |
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virtual void commit_regions(uint start_idx, size_t num_regions = 1, WorkGang* pretouch_workers = NULL); |
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virtual void uncommit_regions(uint start_idx, size_t num_regions = 1); |
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}; |
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#endif // SHARE_GC_G1_G1REGIONTOSPACEMAPPER_HPP |