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 /*

  * Copyright (c) 2005, 2010, 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

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 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP

 #include "gc_implementation/parNew/parNewGeneration.hpp"

 #include "gc_implementation/shared/adaptiveSizePolicy.hpp"

 // A Generation that does parallel young-gen collection extended

 // for adaptive size policy.

 // Division of generation into spaces

 // done by DefNewGeneration::compute_space_boundaries()

 //      +---------------+

 //      | uncommitted   |

 //      |---------------|

 //      | ss0           |

 //      |---------------|

 //      | ss1           |

 //      |---------------|

 //      |               |

 //      | eden          |

 //      |               |

 //      +---------------+       <-- low end of VirtualSpace

 //

 class ASParNewGeneration: public ParNewGeneration {

   size_t _min_gen_size;

   // Resize the generation based on the desired sizes of

   // the constituent spaces.

   bool resize_generation(size_t eden_size, size_t survivor_size);

   // Resize the spaces based on their desired sizes but

   // respecting the maximum size of the generation.

   void resize_spaces(size_t eden_size, size_t survivor_size);

   // Return the byte size remaining to the minimum generation size.

   size_t available_to_min_gen();

   // Return the byte size remaining to the live data in the generation.

   size_t available_to_live() const;

   // Return the byte size that the generation is allowed to shrink.

   size_t limit_gen_shrink(size_t bytes);

   // Reset the size of the spaces after a shrink of the generation.

   void reset_survivors_after_shrink();

   // Accessor

   VirtualSpace* virtual_space() { return &_virtual_space; }

   virtual void adjust_desired_tenuring_threshold();

  public:

   ASParNewGeneration(ReservedSpace rs,

                      size_t initial_byte_size,

                      size_t min_byte_size,

                      int level);

   virtual const char* short_name() const { return "ASParNew"; }

   virtual const char* name() const;

   virtual Generation::Name kind() { return ASParNew; }

   // Change the sizes of eden and the survivor spaces in

   // the generation.  The parameters are desired sizes

   // and are not guaranteed to be met.  For example, if

   // the total is larger than the generation.

   void resize(size_t eden_size, size_t survivor_size);

   virtual void compute_new_size();

   size_t max_gen_size()                 { return _reserved.byte_size(); }

   size_t min_gen_size() const           { return _min_gen_size; }

   // Space boundary invariant checker

   void space_invariants() PRODUCT_RETURN;

 };

 #endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP