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90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
/*
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* Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// A Generation that does parallel young-gen collection extended
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// for adaptive size policy.
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// Division of generation into spaces
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// done by DefNewGeneration::compute_space_boundaries()
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// +---------------+
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// | uncommitted |
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// |---------------|
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// | ss0 |
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// |---------------|
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// | ss1 |
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// |---------------|
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// | |
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// | eden |
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// | |
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// +---------------+ <-- low end of VirtualSpace
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//
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class ASParNewGeneration: public ParNewGeneration {
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size_t _min_gen_size;
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// Resize the generation based on the desired sizes of
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// the constituent spaces.
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bool resize_generation(size_t eden_size, size_t survivor_size);
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// Resize the spaces based on their desired sizes but
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// respecting the maximum size of the generation.
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void resize_spaces(size_t eden_size, size_t survivor_size);
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// Return the byte size remaining to the minimum generation size.
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size_t available_to_min_gen();
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// Return the byte size remaining to the live data in the generation.
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size_t available_to_live() const;
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// Return the byte size that the generation is allowed to shrink.
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size_t limit_gen_shrink(size_t bytes);
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// Reset the size of the spaces after a shrink of the generation.
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void reset_survivors_after_shrink();
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// Accessor
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VirtualSpace* virtual_space() { return &_virtual_space; }
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virtual void adjust_desired_tenuring_threshold();
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public:
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ASParNewGeneration(ReservedSpace rs,
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size_t initial_byte_size,
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size_t min_byte_size,
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int level);
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virtual const char* short_name() const { return "ASParNew"; }
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virtual const char* name() const;
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virtual Generation::Name kind() { return ASParNew; }
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// Change the sizes of eden and the survivor spaces in
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// the generation. The parameters are desired sizes
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// and are not guaranteed to be met. For example, if
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// the total is larger than the generation.
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void resize(size_t eden_size, size_t survivor_size);
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virtual void compute_new_size();
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size_t max_gen_size() { return _reserved.byte_size(); }
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size_t min_gen_size() const { return _min_gen_size; }
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// Space boundary invariant checker
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void space_invariants() PRODUCT_RETURN;
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};
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