jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp@a8ea2f110d87

     1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     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

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    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP

    28 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"

    29 #include "memory/allocation.hpp"

    30 #include "utilities/debug.hpp"

    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   virtual void on_commit(uint start_idx, size_t num_regions) = 0;

    37 };

    39 // Maps region based commit/uncommit requests to the underlying page sized virtual

    40 // space.

    41 class G1RegionToSpaceMapper : public CHeapObj<mtGC> {

    42  private:

    43   G1MappingChangedListener* _listener;

    44  protected:

    45   // Backing storage.

    46   G1PageBasedVirtualSpace _storage;

    47   size_t _commit_granularity;

    48   size_t _region_granularity;

    49   // Mapping management

    50   BitMap _commit_map;

    52   G1RegionToSpaceMapper(ReservedSpace rs, size_t commit_granularity, size_t region_granularity, MemoryType type);

    54   void fire_on_commit(uint start_idx, size_t num_regions);

    55  public:

    56   MemRegion reserved() { return _storage.reserved(); }

    58   void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; }

    60   virtual ~G1RegionToSpaceMapper() {

    61     _commit_map.resize(0, /* in_resource_area */ false);

    62   }

    64   bool is_committed(uintptr_t idx) const {

    65     return _commit_map.at(idx);

    66   }

    68   virtual void commit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;

    69   virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;

    71   // Creates an appropriate G1RegionToSpaceMapper for the given parameters.

    72   // The byte_translation_factor defines how many bytes in a region correspond to

    73   // a single byte in the data structure this mapper is for.

    74   // Eg. in the card table, this value corresponds to the size a single card

    75   // table entry corresponds to.

    76   static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,

    77                                               size_t os_commit_granularity,

    78                                               size_t region_granularity,

    79                                               size_t byte_translation_factor,

    80                                               MemoryType type);

    81 };

    83 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */

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