author | trims |
Thu, 27 May 2010 19:08:38 -0700 | |
changeset 5547 | f4b087cbb361 |
parent 1 | 489c9b5090e2 |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 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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// 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 { |
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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, |
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size_t init_low_byte_size, |
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size_t min_low_byte_size, |
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size_t max_low_byte_size, |
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size_t init_high_byte_size, |
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size_t min_high_byte_size, |
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size_t max_high_bytes_size, |
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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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// Similary 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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}; |