Mercurial > hg > truffle
diff src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,77 @@ +/* + * Copyright 2003 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. + * + */ + + +// Contains two generations that both use an AdjoiningVirtualSpaces. +// The two generations are adjacent in the reserved space for the +// heap. Each generation has a virtual space and shrinking and +// expanding of the generations can still be down with that +// virtual space as was previously done. If expanding of reserved +// size of a generation is required, the adjacent generation +// must be shrunk. Adjusting the boundary between the generations +// is called for in this class. + +class AdjoiningGenerations : public CHeapObj { + friend class VMStructs; + private: + // The young generation and old generation, respectively + PSYoungGen* _young_gen; + PSOldGen* _old_gen; + + // The spaces used by the two generations. + AdjoiningVirtualSpaces _virtual_spaces; + + // Move boundary up to expand old gen. Checks are made to + // determine if the move can be done with specified limits. + void request_old_gen_expansion(size_t desired_change_in_bytes); + // Move boundary down to expand young gen. + bool request_young_gen_expansion(size_t desired_change_in_bytes); + + public: + AdjoiningGenerations(ReservedSpace rs, + size_t init_low_byte_size, + size_t min_low_byte_size, + size_t max_low_byte_size, + size_t init_high_byte_size, + size_t min_high_byte_size, + size_t max_high_bytes_size, + size_t alignment); + + // Accessors + PSYoungGen* young_gen() { return _young_gen; } + PSOldGen* old_gen() { return _old_gen; } + + AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; } + + // Additional space is needed in the old generation. Check + // the available space and attempt to move the boundary if more space + // is needed. The growth is not guaranteed to occur. + void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes); + // Similary for a growth of the young generation. + void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size); + + // Return the total byte size of the reserved space + // for the adjoining generations. + size_t reserved_byte_size(); +};