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view hotspot/src/share/vm/gc_implementation/parNew/asParNewGeneration.hpp @ 1:193df1943809 trunk
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author | xiomara |
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date | Fri, 25 May 2007 00:49:14 +0000 |
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children | 3b9a53e0ec3c |
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#ifdef USE_PRAGMA_IDENT_HDR #pragma ident "@(#)asParNewGeneration.hpp 1.8 07/05/05 17:05:25 JVM" #endif /* * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // 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; };