hotspot/src/share/vm/gc/parallel/adjoiningGenerations.hpp
author pliden
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8079792: GC directory structure cleanup Reviewed-by: brutisso, stefank, david
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/*
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 * Copyright (c) 2003, 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_PARALLEL_ADJOININGGENERATIONS_HPP
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#define SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP
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#include "gc/parallel/adjoiningVirtualSpaces.hpp"
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#include "gc/parallel/asPSOldGen.hpp"
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#include "gc/parallel/asPSYoungGen.hpp"
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#include "gc/parallel/generationSizer.hpp"
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// Contains two generations that both use an AdjoiningVirtualSpaces.
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// The two generations are adjacent in the reserved space for the
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// heap.  Each generation has a virtual space and shrinking and
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// expanding of the generations can still be down with that
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// virtual space as was previously done.  If expanding of reserved
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// size of a generation is required, the adjacent generation
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// must be shrunk.  Adjusting the boundary between the generations
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// is called for in this class.
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class AdjoiningGenerations : public CHeapObj<mtGC> {
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  friend class VMStructs;
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 private:
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  // The young generation and old generation, respectively
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  PSYoungGen* _young_gen;
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  PSOldGen* _old_gen;
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  // The spaces used by the two generations.
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  AdjoiningVirtualSpaces _virtual_spaces;
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  // Move boundary up to expand old gen.  Checks are made to
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  // determine if the move can be done with specified limits.
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  void request_old_gen_expansion(size_t desired_change_in_bytes);
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  // Move boundary down to expand young gen.
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  bool request_young_gen_expansion(size_t desired_change_in_bytes);
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 public:
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  AdjoiningGenerations(ReservedSpace rs, GenerationSizer* policy, size_t alignment);
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  // Accessors
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  PSYoungGen* young_gen() { return _young_gen; }
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  PSOldGen* old_gen() { return _old_gen; }
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  AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; }
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  // Additional space is needed in the old generation.  Check
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  // the available space and attempt to move the boundary if more space
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  // is needed.  The growth is not guaranteed to occur.
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  void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes);
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  // Similarly for a growth of the young generation.
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  void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size);
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  // Return the total byte size of the reserved space
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  // for the adjoining generations.
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  size_t reserved_byte_size();
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};
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#endif // SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP