Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c0492d52d55b |
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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 }; |