jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp@1f1d373cd044 (annotated)

src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp@1f1d373cd044 (annotated)

src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp

Thu, 21 Aug 2014 11:47:10 +0200

author: tschatzl
date: Thu, 21 Aug 2014 11:47:10 +0200
changeset 7051: 1f1d373cd044
child 7053: 7b2fc3129653
permissions: -rw-r--r--

8038423: G1: Decommit memory within heap
Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps.
Reviewed-by: mgerdin, brutisso, jwilhelm

 /*
  * Copyright (c) 2014, 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_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
 #include "utilities/debug.hpp"
 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.
   virtual void on_commit(uint start_idx, size_t num_regions) = 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 _commit_granularity;
   size_t _region_granularity;
   // Mapping management
   BitMap _commit_map;
   G1RegionToSpaceMapper(ReservedSpace rs, size_t commit_granularity, size_t region_granularity, MemoryType type);
   void fire_on_commit(uint start_idx, size_t num_regions);
  public:
   MemRegion reserved() { return _storage.reserved(); }
   void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; }
   virtual ~G1RegionToSpaceMapper() {
     _commit_map.resize(0, /* in_resource_area */ false);
   }
   bool is_committed(uintptr_t idx) const {
     return _commit_map.at(idx);
   }
   virtual void commit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
   virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
   // Creates an appropriate G1RegionToSpaceMapper for the given parameters.
   // 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.
   static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
                                               size_t os_commit_granularity,
                                               size_t region_granularity,
                                               size_t byte_translation_factor,
                                               MemoryType type);
 };
 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */

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src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp@1f1d373cd044 (annotated)

src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp