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src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp@4dfb2df418f2 (annotated)
src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.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) 2001, 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_PSMARKSWEEPDECORATOR_HPP |
| stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #include "gc_implementation/shared/mutableSpace.hpp" |
| stefank@2314 | 29 | |
| duke@435 | 30 | // |
| duke@435 | 31 | // A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations |
| duke@435 | 32 | // to a MutableSpace. |
| duke@435 | 33 | // |
| duke@435 | 34 | |
| duke@435 | 35 | class ObjectStartArray; |
| duke@435 | 36 | |
| duke@435 | 37 | class PSMarkSweepDecorator: public CHeapObj { |
| duke@435 | 38 | private: |
| duke@435 | 39 | static PSMarkSweepDecorator* _destination_decorator; |
| duke@435 | 40 | |
| duke@435 | 41 | protected: |
| duke@435 | 42 | MutableSpace* _space; |
| duke@435 | 43 | ObjectStartArray* _start_array; |
| duke@435 | 44 | HeapWord* _first_dead; |
| duke@435 | 45 | HeapWord* _end_of_live; |
| duke@435 | 46 | HeapWord* _compaction_top; |
| jcoomes@873 | 47 | size_t _allowed_dead_ratio; |
| duke@435 | 48 | |
| jcoomes@873 | 49 | bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q, |
| jcoomes@873 | 50 | size_t word_len); |
| duke@435 | 51 | |
| duke@435 | 52 | public: |
| duke@435 | 53 | PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array, |
| jcoomes@873 | 54 | size_t allowed_dead_ratio) : |
| jcoomes@873 | 55 | _space(space), _start_array(start_array), |
| jcoomes@873 | 56 | _allowed_dead_ratio(allowed_dead_ratio) { } |
| duke@435 | 57 | |
| duke@435 | 58 | // During a compacting collection, we need to collapse objects into |
| duke@435 | 59 | // spaces in a given order. We want to fill space A, space B, and so |
| duke@435 | 60 | // on. The code that controls that order is in the following methods. |
| duke@435 | 61 | static void set_destination_decorator_tenured(); |
| duke@435 | 62 | static void set_destination_decorator_perm_gen(); |
| duke@435 | 63 | static void advance_destination_decorator(); |
| duke@435 | 64 | static PSMarkSweepDecorator* destination_decorator(); |
| duke@435 | 65 | |
| duke@435 | 66 | // Accessors |
| jcoomes@873 | 67 | MutableSpace* space() { return _space; } |
| jcoomes@873 | 68 | ObjectStartArray* start_array() { return _start_array; } |
| duke@435 | 69 | |
| jcoomes@873 | 70 | HeapWord* compaction_top() { return _compaction_top; } |
| jcoomes@873 | 71 | void set_compaction_top(HeapWord* value) { _compaction_top = value; } |
| duke@435 | 72 | |
| jcoomes@873 | 73 | size_t allowed_dead_ratio() { return _allowed_dead_ratio; } |
| jcoomes@873 | 74 | void set_allowed_dead_ratio(size_t value) { _allowed_dead_ratio = value; } |
| duke@435 | 75 | |
| duke@435 | 76 | // Work methods |
| duke@435 | 77 | void adjust_pointers(); |
| duke@435 | 78 | void precompact(); |
| duke@435 | 79 | void compact(bool mangle_free_space); |
| duke@435 | 80 | }; |
| stefank@2314 | 81 | |
| stefank@2314 | 82 | #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEPDECORATOR_HPP |
