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comparison src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 class CardTableRS; // fwd decl
26 class ConcurrentMarkSweepGeneration;
27
28 // A PermGen implemented with a CMS space, collected by a CMS collector.
29 class CMSPermGen: public PermGen {
30 friend class VMStructs;
31
32 HeapWord* mem_allocate_work(size_t size);
33 protected:
34 // The "generation" view.
35 ConcurrentMarkSweepGeneration* _gen;
36
37 public:
38 CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
39 CardTableRS* ct, FreeBlockDictionary::DictionaryChoice);
40
41 HeapWord* mem_allocate(size_t size);
42
43 void compute_new_size();
44
45 Generation* as_gen() const { return _gen; }
46 };
47
48 // This is the "generation" view of a CMSPermGen.
49 class CMSPermGenGen: public ConcurrentMarkSweepGeneration {
50 // Abstractly, this is a subtype that gets access to protected fields.
51 friend class CMSPermGen;
52 public:
53 CMSPermGenGen(ReservedSpace rs, size_t initial_byte_size,
54 int level, CardTableRS* ct):
55 // See comments in the constructor for CompactibleFreeListSpace
56 // regarding not using adaptive free lists for a perm gen.
57 ConcurrentMarkSweepGeneration(rs, initial_byte_size, // MinPermHeapExapnsion
58 level, ct, false /* use adaptive freelists */,
59 (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice)
60 {}
61
62 void initialize_performance_counters();
63
64 const char* name() const {
65 return "concurrent-mark-sweep perm gen";
66 }
67
68 const char* short_name() const {
69 return "CMS Perm";
70 }
71
72 bool must_be_youngest() const { return false; }
73 bool must_be_oldest() const { return false; }
74 };