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src/share/vm/gc_implementation/parallelScavenge/psPermGen.hpp@4dfb2df418f2 (annotated)
src/share/vm/gc_implementation/parallelScavenge/psPermGen.hpp
Thu, 22 Sep 2011 10:57:37 -0700
- author
- johnc
- date
- Thu, 22 Sep 2011 10:57:37 -0700
- changeset 3175
- 4dfb2df418f2
- parent 2783
- eda9eb483d29
- 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 | /* |
| jcoomes@2783 | 2 | * Copyright (c) 2001, 2011, 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_PSPERMGEN_HPP |
| stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPERMGEN_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #include "gc_implementation/parallelScavenge/psOldGen.hpp" |
| stefank@2314 | 29 | |
| duke@435 | 30 | class AdaptivePaddedAverage; |
| duke@435 | 31 | |
| duke@435 | 32 | class PSPermGen : public PSOldGen { |
| duke@435 | 33 | friend class VMStructs; |
| duke@435 | 34 | protected: |
| duke@435 | 35 | AdaptivePaddedAverage* _avg_size; // Used for sizing |
| duke@435 | 36 | size_t _last_used; // Amount used at last GC, used for sizing |
| duke@435 | 37 | |
| duke@435 | 38 | public: |
| duke@435 | 39 | // Initialize the generation. |
| duke@435 | 40 | PSPermGen(ReservedSpace rs, size_t alignment, size_t initial_byte_size, |
| duke@435 | 41 | size_t minimum_byte_size, size_t maximum_byte_size, |
| duke@435 | 42 | const char* gen_name, int level); |
| duke@435 | 43 | |
| duke@435 | 44 | // Permanent Gen special allocation. Uses the OldGen allocation |
| duke@435 | 45 | // routines, which should not be directly called on this generation. |
| duke@435 | 46 | HeapWord* allocate_permanent(size_t word_size); |
| duke@435 | 47 | |
| duke@435 | 48 | // Size calculation. |
| duke@435 | 49 | void compute_new_size(size_t used_before_collection); |
| duke@435 | 50 | |
| duke@435 | 51 | // MarkSweep code |
| duke@435 | 52 | virtual void precompact(); |
| duke@435 | 53 | |
| duke@435 | 54 | virtual const char* name() const { return "PSPermGen"; } |
| duke@435 | 55 | }; |
| stefank@2314 | 56 | |
| stefank@2314 | 57 | #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPERMGEN_HPP |
