Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 8f07aa079343 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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| 5 * This code is free software; you can redistribute it and/or modify it | |
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| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
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| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
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| 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 * | |
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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 | |
| 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 |