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src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp@4dfb2df418f2 (annotated)
src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp
Thu, 22 Sep 2011 10:57:37 -0700
- author
- johnc
- date
- Thu, 22 Sep 2011 10:57:37 -0700
- changeset 3175
- 4dfb2df418f2
- parent 2314
- f95d63e2154a
- child 3900
- d2a62e0f25eb
- permissions
- -rw-r--r--
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
| duke@435 | 1 | /* |
| stefank@2314 | 2 | * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |
| stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" |
| stefank@2314 | 29 | #include "gc_implementation/parallelScavenge/asPSOldGen.hpp" |
| stefank@2314 | 30 | #include "gc_implementation/parallelScavenge/asPSYoungGen.hpp" |
| stefank@2314 | 31 | #include "gc_implementation/parallelScavenge/psPermGen.hpp" |
| stefank@2314 | 32 | |
| duke@435 | 33 | |
| duke@435 | 34 | // Contains two generations that both use an AdjoiningVirtualSpaces. |
| duke@435 | 35 | // The two generations are adjacent in the reserved space for the |
| duke@435 | 36 | // heap. Each generation has a virtual space and shrinking and |
| duke@435 | 37 | // expanding of the generations can still be down with that |
| duke@435 | 38 | // virtual space as was previously done. If expanding of reserved |
| duke@435 | 39 | // size of a generation is required, the adjacent generation |
| duke@435 | 40 | // must be shrunk. Adjusting the boundary between the generations |
| duke@435 | 41 | // is called for in this class. |
| duke@435 | 42 | |
| duke@435 | 43 | class AdjoiningGenerations : public CHeapObj { |
| duke@435 | 44 | friend class VMStructs; |
| duke@435 | 45 | private: |
| duke@435 | 46 | // The young generation and old generation, respectively |
| duke@435 | 47 | PSYoungGen* _young_gen; |
| duke@435 | 48 | PSOldGen* _old_gen; |
| duke@435 | 49 | |
| duke@435 | 50 | // The spaces used by the two generations. |
| duke@435 | 51 | AdjoiningVirtualSpaces _virtual_spaces; |
| duke@435 | 52 | |
| duke@435 | 53 | // Move boundary up to expand old gen. Checks are made to |
| duke@435 | 54 | // determine if the move can be done with specified limits. |
| duke@435 | 55 | void request_old_gen_expansion(size_t desired_change_in_bytes); |
| duke@435 | 56 | // Move boundary down to expand young gen. |
| duke@435 | 57 | bool request_young_gen_expansion(size_t desired_change_in_bytes); |
| duke@435 | 58 | |
| duke@435 | 59 | public: |
| duke@435 | 60 | AdjoiningGenerations(ReservedSpace rs, |
| duke@435 | 61 | size_t init_low_byte_size, |
| duke@435 | 62 | size_t min_low_byte_size, |
| duke@435 | 63 | size_t max_low_byte_size, |
| duke@435 | 64 | size_t init_high_byte_size, |
| duke@435 | 65 | size_t min_high_byte_size, |
| duke@435 | 66 | size_t max_high_bytes_size, |
| duke@435 | 67 | size_t alignment); |
| duke@435 | 68 | |
| duke@435 | 69 | // Accessors |
| duke@435 | 70 | PSYoungGen* young_gen() { return _young_gen; } |
| duke@435 | 71 | PSOldGen* old_gen() { return _old_gen; } |
| duke@435 | 72 | |
| duke@435 | 73 | AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; } |
| duke@435 | 74 | |
| duke@435 | 75 | // Additional space is needed in the old generation. Check |
| duke@435 | 76 | // the available space and attempt to move the boundary if more space |
| duke@435 | 77 | // is needed. The growth is not guaranteed to occur. |
| duke@435 | 78 | void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes); |
| duke@435 | 79 | // Similary for a growth of the young generation. |
| duke@435 | 80 | void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size); |
| duke@435 | 81 | |
| duke@435 | 82 | // Return the total byte size of the reserved space |
| duke@435 | 83 | // for the adjoining generations. |
| duke@435 | 84 | size_t reserved_byte_size(); |
| duke@435 | 85 | }; |
| stefank@2314 | 86 | |
| stefank@2314 | 87 | #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |
