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src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp@f90c822e73f8 (annotated)
src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.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) 2001, 2012, 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_PSMARKSWEEPDECORATOR_HPP |
| aoqi@0 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "gc_implementation/shared/mutableSpace.hpp" |
| aoqi@0 | 29 | |
| aoqi@0 | 30 | // |
| aoqi@0 | 31 | // A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations |
| aoqi@0 | 32 | // to a MutableSpace. |
| aoqi@0 | 33 | // |
| aoqi@0 | 34 | |
| aoqi@0 | 35 | class ObjectStartArray; |
| aoqi@0 | 36 | |
| aoqi@0 | 37 | class PSMarkSweepDecorator: public CHeapObj<mtGC> { |
| aoqi@0 | 38 | private: |
| aoqi@0 | 39 | static PSMarkSweepDecorator* _destination_decorator; |
| aoqi@0 | 40 | |
| aoqi@0 | 41 | protected: |
| aoqi@0 | 42 | MutableSpace* _space; |
| aoqi@0 | 43 | ObjectStartArray* _start_array; |
| aoqi@0 | 44 | HeapWord* _first_dead; |
| aoqi@0 | 45 | HeapWord* _end_of_live; |
| aoqi@0 | 46 | HeapWord* _compaction_top; |
| aoqi@0 | 47 | size_t _allowed_dead_ratio; |
| aoqi@0 | 48 | |
| aoqi@0 | 49 | bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q, |
| aoqi@0 | 50 | size_t word_len); |
| aoqi@0 | 51 | |
| aoqi@0 | 52 | public: |
| aoqi@0 | 53 | PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array, |
| aoqi@0 | 54 | size_t allowed_dead_ratio) : |
| aoqi@0 | 55 | _space(space), _start_array(start_array), |
| aoqi@0 | 56 | _allowed_dead_ratio(allowed_dead_ratio) { } |
| aoqi@0 | 57 | |
| aoqi@0 | 58 | // During a compacting collection, we need to collapse objects into |
| aoqi@0 | 59 | // spaces in a given order. We want to fill space A, space B, and so |
| aoqi@0 | 60 | // on. The code that controls that order is in the following methods. |
| aoqi@0 | 61 | static void set_destination_decorator_tenured(); |
| aoqi@0 | 62 | static void advance_destination_decorator(); |
| aoqi@0 | 63 | static PSMarkSweepDecorator* destination_decorator(); |
| aoqi@0 | 64 | |
| aoqi@0 | 65 | // Accessors |
| aoqi@0 | 66 | MutableSpace* space() { return _space; } |
| aoqi@0 | 67 | ObjectStartArray* start_array() { return _start_array; } |
| aoqi@0 | 68 | |
| aoqi@0 | 69 | HeapWord* compaction_top() { return _compaction_top; } |
| aoqi@0 | 70 | void set_compaction_top(HeapWord* value) { _compaction_top = value; } |
| aoqi@0 | 71 | |
| aoqi@0 | 72 | size_t allowed_dead_ratio() { return _allowed_dead_ratio; } |
| aoqi@0 | 73 | void set_allowed_dead_ratio(size_t value) { _allowed_dead_ratio = value; } |
| aoqi@0 | 74 | |
| aoqi@0 | 75 | // Work methods |
| aoqi@0 | 76 | void adjust_pointers(); |
| aoqi@0 | 77 | void precompact(); |
| aoqi@0 | 78 | void compact(bool mangle_free_space); |
| aoqi@0 | 79 | }; |
| aoqi@0 | 80 | |
| aoqi@0 | 81 | #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP |
