Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp @ 10180:ebded0261dfc
8012111: Remove warning about CMS generation shrinking.
Reviewed-by: johnc, brutisso, stefank
author | jmasa |
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date | Mon, 22 Apr 2013 22:00:03 -0700 |
parents | da91efe96a93 |
children | 8f07aa079343 |
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0 | 1 /* |
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6964458: Reimplement class meta-data storage to use native memory
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" | |
29 #include "gc_implementation/parallelScavenge/asPSOldGen.hpp" | |
30 #include "gc_implementation/parallelScavenge/asPSYoungGen.hpp" | |
31 | |
0 | 32 |
33 // Contains two generations that both use an AdjoiningVirtualSpaces. | |
34 // The two generations are adjacent in the reserved space for the | |
35 // heap. Each generation has a virtual space and shrinking and | |
36 // expanding of the generations can still be down with that | |
37 // virtual space as was previously done. If expanding of reserved | |
38 // size of a generation is required, the adjacent generation | |
39 // must be shrunk. Adjusting the boundary between the generations | |
40 // is called for in this class. | |
41 | |
6197 | 42 class AdjoiningGenerations : public CHeapObj<mtGC> { |
0 | 43 friend class VMStructs; |
44 private: | |
45 // The young generation and old generation, respectively | |
46 PSYoungGen* _young_gen; | |
47 PSOldGen* _old_gen; | |
48 | |
49 // The spaces used by the two generations. | |
50 AdjoiningVirtualSpaces _virtual_spaces; | |
51 | |
52 // Move boundary up to expand old gen. Checks are made to | |
53 // determine if the move can be done with specified limits. | |
54 void request_old_gen_expansion(size_t desired_change_in_bytes); | |
55 // Move boundary down to expand young gen. | |
56 bool request_young_gen_expansion(size_t desired_change_in_bytes); | |
57 | |
58 public: | |
59 AdjoiningGenerations(ReservedSpace rs, | |
60 size_t init_low_byte_size, | |
61 size_t min_low_byte_size, | |
62 size_t max_low_byte_size, | |
63 size_t init_high_byte_size, | |
64 size_t min_high_byte_size, | |
65 size_t max_high_bytes_size, | |
66 size_t alignment); | |
67 | |
68 // Accessors | |
69 PSYoungGen* young_gen() { return _young_gen; } | |
70 PSOldGen* old_gen() { return _old_gen; } | |
71 | |
72 AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; } | |
73 | |
74 // Additional space is needed in the old generation. Check | |
75 // the available space and attempt to move the boundary if more space | |
76 // is needed. The growth is not guaranteed to occur. | |
77 void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes); | |
78 // Similary for a growth of the young generation. | |
79 void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size); | |
80 | |
81 // Return the total byte size of the reserved space | |
82 // for the adjoining generations. | |
83 size_t reserved_byte_size(); | |
84 }; | |
1972 | 85 |
86 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGGENERATIONS_HPP |