duke@435: /*
duke@435:  * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // A Generation that does parallel young-gen collection extended
duke@435: // for adaptive size policy.
duke@435: 
duke@435: // Division of generation into spaces
duke@435: // done by DefNewGeneration::compute_space_boundaries()
duke@435: //      +---------------+
duke@435: //      | uncommitted   |
duke@435: //      |---------------|
duke@435: //      | ss0           |
duke@435: //      |---------------|
duke@435: //      | ss1           |
duke@435: //      |---------------|
duke@435: //      |               |
duke@435: //      | eden          |
duke@435: //      |               |
duke@435: //      +---------------+       <-- low end of VirtualSpace
duke@435: //
duke@435: class ASParNewGeneration: public ParNewGeneration {
duke@435: 
duke@435:   size_t _min_gen_size;
duke@435: 
duke@435:   // Resize the generation based on the desired sizes of
duke@435:   // the constituent spaces.
duke@435:   bool resize_generation(size_t eden_size, size_t survivor_size);
duke@435:   // Resize the spaces based on their desired sizes but
duke@435:   // respecting the maximum size of the generation.
duke@435:   void resize_spaces(size_t eden_size, size_t survivor_size);
duke@435:   // Return the byte size remaining to the minimum generation size.
duke@435:   size_t available_to_min_gen();
duke@435:   // Return the byte size remaining to the live data in the generation.
duke@435:   size_t available_to_live() const;
duke@435:   // Return the byte size that the generation is allowed to shrink.
duke@435:   size_t limit_gen_shrink(size_t bytes);
duke@435:   // Reset the size of the spaces after a shrink of the generation.
duke@435:   void reset_survivors_after_shrink();
duke@435: 
duke@435:   // Accessor
duke@435:   VirtualSpace* virtual_space() { return &_virtual_space; }
duke@435: 
duke@435:   virtual void adjust_desired_tenuring_threshold();
duke@435: 
duke@435:  public:
duke@435: 
duke@435:   ASParNewGeneration(ReservedSpace rs,
duke@435:                      size_t initial_byte_size,
duke@435:                      size_t min_byte_size,
duke@435:                      int level);
duke@435: 
duke@435:   virtual const char* short_name() const { return "ASParNew"; }
duke@435:   virtual const char* name() const;
duke@435:   virtual Generation::Name kind() { return ASParNew; }
duke@435: 
duke@435:   // Change the sizes of eden and the survivor spaces in
duke@435:   // the generation.  The parameters are desired sizes
duke@435:   // and are not guaranteed to be met.  For example, if
duke@435:   // the total is larger than the generation.
duke@435:   void resize(size_t eden_size, size_t survivor_size);
duke@435: 
duke@435:   virtual void compute_new_size();
duke@435: 
duke@435:   size_t max_gen_size()                 { return _reserved.byte_size(); }
duke@435:   size_t min_gen_size() const           { return _min_gen_size; }
duke@435: 
duke@435:   // Space boundary invariant checker
duke@435:   void space_invariants() PRODUCT_RETURN;
duke@435: };