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src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp@4947ee68d19c (annotated)
src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp
Thu, 06 Jan 2011 23:50:02 -0800
- author
- ysr
- date
- Thu, 06 Jan 2011 23:50:02 -0800
- changeset 2452
- 4947ee68d19c
- parent 2314
- f95d63e2154a
- child 3730
- 9f059abe8cf2
- permissions
- -rw-r--r--
7008136: CMS: assert((HeapWord*)nextChunk <= _limit) failed: sweep invariant
Summary: The recorded _sweep_limit may not necessarily remain a block boundary as the old generation expands during a concurrent cycle. Terminal actions inside the sweep closure need to be aware of this as they cross over the limit.
Reviewed-by: johnc, minqi
| duke@435 | 1 | /* |
| stefank@2314 | 2 | * Copyright (c) 2007, 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_CONCURRENTMARKSWEEP_CMSPERMGEN_HPP |
| stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSPERMGEN_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp" |
| stefank@2314 | 29 | #include "memory/permGen.hpp" |
| stefank@2314 | 30 | |
| duke@435 | 31 | class CardTableRS; // fwd decl |
| duke@435 | 32 | class ConcurrentMarkSweepGeneration; |
| duke@435 | 33 | |
| duke@435 | 34 | // A PermGen implemented with a CMS space, collected by a CMS collector. |
| duke@435 | 35 | class CMSPermGen: public PermGen { |
| duke@435 | 36 | friend class VMStructs; |
| duke@435 | 37 | |
| duke@435 | 38 | protected: |
| duke@435 | 39 | // The "generation" view. |
| duke@435 | 40 | ConcurrentMarkSweepGeneration* _gen; |
| duke@435 | 41 | |
| ysr@2194 | 42 | // Override default implementation from PermGen |
| ysr@2194 | 43 | virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size, |
| ysr@2194 | 44 | GCCause::Cause prev_cause); |
| ysr@2194 | 45 | |
| duke@435 | 46 | public: |
| duke@435 | 47 | CMSPermGen(ReservedSpace rs, size_t initial_byte_size, |
| duke@435 | 48 | CardTableRS* ct, FreeBlockDictionary::DictionaryChoice); |
| duke@435 | 49 | |
| duke@435 | 50 | HeapWord* mem_allocate(size_t size); |
| duke@435 | 51 | |
| duke@435 | 52 | void compute_new_size(); |
| duke@435 | 53 | |
| duke@435 | 54 | Generation* as_gen() const { return _gen; } |
| duke@435 | 55 | }; |
| duke@435 | 56 | |
| duke@435 | 57 | // This is the "generation" view of a CMSPermGen. |
| duke@435 | 58 | class CMSPermGenGen: public ConcurrentMarkSweepGeneration { |
| duke@435 | 59 | // Abstractly, this is a subtype that gets access to protected fields. |
| duke@435 | 60 | friend class CMSPermGen; |
| duke@435 | 61 | public: |
| duke@435 | 62 | CMSPermGenGen(ReservedSpace rs, size_t initial_byte_size, |
| duke@435 | 63 | int level, CardTableRS* ct): |
| duke@435 | 64 | // See comments in the constructor for CompactibleFreeListSpace |
| duke@435 | 65 | // regarding not using adaptive free lists for a perm gen. |
| duke@435 | 66 | ConcurrentMarkSweepGeneration(rs, initial_byte_size, // MinPermHeapExapnsion |
| duke@435 | 67 | level, ct, false /* use adaptive freelists */, |
| duke@435 | 68 | (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice) |
| duke@435 | 69 | {} |
| duke@435 | 70 | |
| duke@435 | 71 | void initialize_performance_counters(); |
| duke@435 | 72 | |
| duke@435 | 73 | const char* name() const { |
| duke@435 | 74 | return "concurrent-mark-sweep perm gen"; |
| duke@435 | 75 | } |
| duke@435 | 76 | |
| duke@435 | 77 | const char* short_name() const { |
| duke@435 | 78 | return "CMS Perm"; |
| duke@435 | 79 | } |
| duke@435 | 80 | |
| duke@435 | 81 | bool must_be_youngest() const { return false; } |
| duke@435 | 82 | bool must_be_oldest() const { return false; } |
| duke@435 | 83 | }; |
| stefank@2314 | 84 | |
| stefank@2314 | 85 | #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSPERMGEN_HPP |
