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1 /* |
1 /* |
2 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. |
2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
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 |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. |
7 * published by the Free Software Foundation. |
28 |
28 |
29 class Generation; |
29 class Generation; |
30 class GenRemSet; |
30 class GenRemSet; |
31 class CSpaceCounters; |
31 class CSpaceCounters; |
32 |
32 |
33 // PermGen models the part of the heap |
33 // PermGen models the part of the heap used to allocate class meta-data. |
34 |
34 |
35 class PermGen : public CHeapObj { |
35 class PermGen : public CHeapObj { |
36 friend class VMStructs; |
36 friend class VMStructs; |
37 protected: |
37 protected: |
38 size_t _capacity_expansion_limit; // maximum expansion allowed without a |
38 size_t _capacity_expansion_limit; // maximum expansion allowed without a |
39 // full gc occurring |
39 // full gc occurring |
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40 void set_capacity_expansion_limit(size_t limit) { |
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41 assert_locked_or_safepoint(Heap_lock); |
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42 _capacity_expansion_limit = limit; |
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43 } |
40 |
44 |
41 HeapWord* mem_allocate_in_gen(size_t size, Generation* gen); |
45 HeapWord* mem_allocate_in_gen(size_t size, Generation* gen); |
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46 // Along with mem_allocate_in_gen() above, implements policy for |
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47 // "scheduling" allocation/expansion/collection of the perm gen. |
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48 // The virtual method request_...() below can be overridden by |
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49 // subtypes that want to implement a different expansion/collection |
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50 // policy from the default provided. |
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51 virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size, |
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52 GCCause::Cause prev_cause); |
42 |
53 |
43 public: |
54 public: |
44 enum Name { |
55 enum Name { |
45 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep |
56 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep |
46 }; |
57 }; |