1 /*
2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
26 #define SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP
27
28 #include "gc/parallel/adjoiningVirtualSpaces.hpp"
29 #include "gc/parallel/asPSOldGen.hpp"
30 #include "gc/parallel/asPSYoungGen.hpp"
31 #include "gc/parallel/generationSizer.hpp"
32
33
34 // Contains two generations that both use an AdjoiningVirtualSpaces.
35 // The two generations are adjacent in the reserved space for the
36 // heap. Each generation has a virtual space and shrinking and
37 // expanding of the generations can still be down with that
38 // virtual space as was previously done. If expanding of reserved
39 // size of a generation is required, the adjacent generation
40 // must be shrunk. Adjusting the boundary between the generations
41 // is called for in this class.
42
43 class AdjoiningGenerations : public CHeapObj<mtGC> {
44 friend class VMStructs;
45 private:
46 // The young generation and old generation, respectively
47 PSYoungGen* _young_gen;
48 PSOldGen* _old_gen;
49
50 // The spaces used by the two generations.
51 AdjoiningVirtualSpaces _virtual_spaces;
52
53 // Move boundary up to expand old gen. Checks are made to
54 // determine if the move can be done with specified limits.
55 void request_old_gen_expansion(size_t desired_change_in_bytes);
56 // Move boundary down to expand young gen.
57 bool request_young_gen_expansion(size_t desired_change_in_bytes);
58
59 public:
60 AdjoiningGenerations(ReservedSpace rs, GenerationSizer* policy, size_t alignment);
61
62 // Accessors
63 PSYoungGen* young_gen() { return _young_gen; }
64 PSOldGen* old_gen() { return _old_gen; }
65
66 AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; }
67
68 // Additional space is needed in the old generation. Check
69 // the available space and attempt to move the boundary if more space
70 // is needed. The growth is not guaranteed to occur.
71 void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes);
72 // Similarly for a growth of the young generation.
73 void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size);
74
75 // Return the total byte size of the reserved space
76 // for the adjoining generations.
77 size_t reserved_byte_size();
78 };
79
80 #endif // SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP
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1 /*
2 * Copyright (c) 2003, 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
26 #define SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP
27
28 #include "gc/parallel/adjoiningVirtualSpaces.hpp"
29 #include "gc/parallel/asPSOldGen.hpp"
30 #include "gc/parallel/asPSYoungGen.hpp"
31 #include "gc/parallel/generationSizer.hpp"
32
33
34 // Contains two generations that both use an AdjoiningVirtualSpaces.
35 // The two generations are adjacent in the reserved space for the
36 // heap. Each generation has a virtual space and shrinking and
37 // expanding of the generations can still be down with that
38 // virtual space as was previously done. If expanding of reserved
39 // size of a generation is required, the adjacent generation
40 // must be shrunk. Adjusting the boundary between the generations
41 // is called for in this class.
42
43 class AdjoiningGenerations : public CHeapObj<mtGC> {
44 friend class VMStructs;
45 private:
46 // Move boundary up to expand old gen. Checks are made to
47 // determine if the move can be done with specified limits.
48 void request_old_gen_expansion(size_t desired_change_in_bytes);
49 // Move boundary down to expand young gen.
50 bool request_young_gen_expansion(size_t desired_change_in_bytes);
51
52 protected:
53 // The young generation and old generation, respectively
54 PSYoungGen* _young_gen;
55 PSOldGen* _old_gen;
56
57 // The spaces used by the two generations.
58 AdjoiningVirtualSpaces* _virtual_spaces;
59
60 public:
61 AdjoiningGenerations(ReservedSpace rs, GenerationSizer* policy, size_t alignment);
62 AdjoiningGenerations();
63
64 // Accessors
65 PSYoungGen* young_gen() { return _young_gen; }
66 PSOldGen* old_gen() { return _old_gen; }
67
68 AdjoiningVirtualSpaces* virtual_spaces() { return _virtual_spaces; }
69
70 // Additional space is needed in the old generation. Check
71 // the available space and attempt to move the boundary if more space
72 // is needed. The growth is not guaranteed to occur.
73 void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes);
74 // Similarly for a growth of the young generation.
75 void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size);
76
77 // Return the total byte size of the reserved space
78 // for the adjoining generations.
79 virtual size_t reserved_byte_size();
80 };
81 #endif // SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP
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