Mercurial > hg > truffle
annotate src/share/vm/memory/generationSpec.hpp @ 1839:e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
Summary: Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently.
Reviewed-by: johnc
author | ysr |
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date | Fri, 01 Oct 2010 16:12:54 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // The specification of a generation. This class also encapsulates | |
26 // some generation-specific behavior. This is done here rather than as a | |
27 // virtual function of Generation because these methods are needed in | |
28 // initialization of the Generations. | |
29 class GenerationSpec : public CHeapObj { | |
30 friend class VMStructs; | |
31 private: | |
32 Generation::Name _name; | |
33 size_t _init_size; | |
34 size_t _max_size; | |
35 | |
36 public: | |
37 GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) { | |
38 _name = name; | |
39 _init_size = init_size; | |
40 _max_size = max_size; | |
41 } | |
42 | |
43 Generation* init(ReservedSpace rs, int level, GenRemSet* remset); | |
44 | |
45 // Accessors | |
46 Generation::Name name() const { return _name; } | |
47 size_t init_size() const { return _init_size; } | |
48 void set_init_size(size_t size) { _init_size = size; } | |
49 size_t max_size() const { return _max_size; } | |
50 void set_max_size(size_t size) { _max_size = size; } | |
51 | |
52 // Alignment | |
53 void align(size_t alignment) { | |
54 set_init_size(align_size_up(init_size(), alignment)); | |
55 set_max_size(align_size_up(max_size(), alignment)); | |
56 } | |
57 | |
58 // Return the number of regions contained in the generation which | |
59 // might need to be independently covered by a remembered set. | |
60 virtual int n_covered_regions() const { return 1; } | |
61 }; | |
62 | |
63 typedef GenerationSpec* GenerationSpecPtr; | |
64 | |
65 // The specification of a permanent generation. This class is very | |
66 // similar to GenerationSpec in use. Due to PermGen's not being a | |
67 // true Generation, we cannot combine the spec classes either. | |
68 class PermanentGenerationSpec : public CHeapObj { | |
69 friend class VMStructs; | |
70 private: | |
71 PermGen::Name _name; | |
72 size_t _init_size; | |
73 size_t _max_size; | |
74 size_t _read_only_size; | |
75 size_t _read_write_size; | |
76 size_t _misc_data_size; | |
77 size_t _misc_code_size; | |
78 bool _enable_shared_spaces; | |
79 | |
80 enum { | |
81 _n_spaces = 2 | |
82 }; | |
83 | |
84 public: | |
85 PermanentGenerationSpec(PermGen::Name name, size_t init_size, | |
86 size_t max_size, size_t read_only_size, | |
87 size_t read_write_size, size_t misc_data_size, | |
88 size_t misc_code_size); | |
89 | |
90 PermGen* init(ReservedSpace rs, size_t init_size, GenRemSet* remset); | |
91 | |
92 void disable_sharing() { | |
93 _enable_shared_spaces = false; | |
94 _read_only_size = 0; | |
95 _read_write_size = 0; | |
96 _misc_data_size = 0; | |
97 _misc_code_size = 0; | |
98 } | |
99 | |
100 // Accessors | |
101 PermGen::Name name() const { return _name; } | |
102 size_t init_size() const { return _init_size; } | |
103 void set_init_size(size_t size) { _init_size = size; } | |
104 | |
105 // Max size for user DOES NOT include shared spaces. | |
106 // Max size for space allocation DOES include shared spaces. | |
107 size_t max_size() const { | |
108 return _max_size + _read_only_size + _read_write_size; | |
109 } | |
110 | |
111 // Need one covered region for the main space, and one for the shared | |
112 // spaces (together). | |
113 int n_covered_regions() const { return 2; } | |
114 | |
115 void align(size_t alignment); | |
116 | |
117 size_t read_only_size() const { return _read_only_size; } | |
118 size_t read_write_size() const { return _read_write_size; } | |
119 size_t misc_data_size() const { return _misc_data_size; } | |
120 size_t misc_code_size() const { return _misc_code_size; } | |
121 bool enable_shared_spaces() const { return _enable_shared_spaces; } | |
122 }; |