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src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp@f90c822e73f8 (annotated)
src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp
Wed, 27 Apr 2016 01:25:04 +0800
- author
- aoqi
- date
- Wed, 27 Apr 2016 01:25:04 +0800
- changeset 0
- f90c822e73f8
- child 6876
- 710a3c8b516e
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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |
| aoqi@0 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" |
| aoqi@0 | 29 | #include "gc_implementation/parallelScavenge/asPSOldGen.hpp" |
| aoqi@0 | 30 | #include "gc_implementation/parallelScavenge/asPSYoungGen.hpp" |
| aoqi@0 | 31 | #include "gc_implementation/parallelScavenge/generationSizer.hpp" |
| aoqi@0 | 32 | |
| aoqi@0 | 33 | |
| aoqi@0 | 34 | // Contains two generations that both use an AdjoiningVirtualSpaces. |
| aoqi@0 | 35 | // The two generations are adjacent in the reserved space for the |
| aoqi@0 | 36 | // heap. Each generation has a virtual space and shrinking and |
| aoqi@0 | 37 | // expanding of the generations can still be down with that |
| aoqi@0 | 38 | // virtual space as was previously done. If expanding of reserved |
| aoqi@0 | 39 | // size of a generation is required, the adjacent generation |
| aoqi@0 | 40 | // must be shrunk. Adjusting the boundary between the generations |
| aoqi@0 | 41 | // is called for in this class. |
| aoqi@0 | 42 | |
| aoqi@0 | 43 | class AdjoiningGenerations : public CHeapObj<mtGC> { |
| aoqi@0 | 44 | friend class VMStructs; |
| aoqi@0 | 45 | private: |
| aoqi@0 | 46 | // The young generation and old generation, respectively |
| aoqi@0 | 47 | PSYoungGen* _young_gen; |
| aoqi@0 | 48 | PSOldGen* _old_gen; |
| aoqi@0 | 49 | |
| aoqi@0 | 50 | // The spaces used by the two generations. |
| aoqi@0 | 51 | AdjoiningVirtualSpaces _virtual_spaces; |
| aoqi@0 | 52 | |
| aoqi@0 | 53 | // Move boundary up to expand old gen. Checks are made to |
| aoqi@0 | 54 | // determine if the move can be done with specified limits. |
| aoqi@0 | 55 | void request_old_gen_expansion(size_t desired_change_in_bytes); |
| aoqi@0 | 56 | // Move boundary down to expand young gen. |
| aoqi@0 | 57 | bool request_young_gen_expansion(size_t desired_change_in_bytes); |
| aoqi@0 | 58 | |
| aoqi@0 | 59 | public: |
| aoqi@0 | 60 | AdjoiningGenerations(ReservedSpace rs, GenerationSizer* policy, size_t alignment); |
| aoqi@0 | 61 | |
| aoqi@0 | 62 | // Accessors |
| aoqi@0 | 63 | PSYoungGen* young_gen() { return _young_gen; } |
| aoqi@0 | 64 | PSOldGen* old_gen() { return _old_gen; } |
| aoqi@0 | 65 | |
| aoqi@0 | 66 | AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; } |
| aoqi@0 | 67 | |
| aoqi@0 | 68 | // Additional space is needed in the old generation. Check |
| aoqi@0 | 69 | // the available space and attempt to move the boundary if more space |
| aoqi@0 | 70 | // is needed. The growth is not guaranteed to occur. |
| aoqi@0 | 71 | void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes); |
| aoqi@0 | 72 | // Similary for a growth of the young generation. |
| aoqi@0 | 73 | void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size); |
| aoqi@0 | 74 | |
| aoqi@0 | 75 | // Return the total byte size of the reserved space |
| aoqi@0 | 76 | // for the adjoining generations. |
| aoqi@0 | 77 | size_t reserved_byte_size(); |
| aoqi@0 | 78 | }; |
| aoqi@0 | 79 | |
| aoqi@0 | 80 | #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |
