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annotate src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp @ 7200:dd38cfd12c3a
8004319: test/gc/7168848/HumongousAlloc.java fails after 7172640
Reviewed-by: kvn, johnc
author | twisti |
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date | Mon, 03 Dec 2012 15:48:49 -0800 |
parents | f95d63e2154a |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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_ADJOININGVIRTUALSPACES_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGVIRTUALSPACES_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" | |
29 | |
0 | 30 |
31 // Contains two virtual spaces that each can individually span | |
32 // most of the reserved region but committed parts of which | |
33 // cannot overlap. | |
34 // | |
35 // +-------+ <--- high_boundary for H | |
36 // | | | |
37 // | H | | |
38 // | | | |
39 // | | | |
40 // | | | |
41 // --------- <--- low for H | |
42 // | | | |
43 // ========= <--- low_boundary for H, high_boundary for L | |
44 // | | | |
45 // | | | |
46 // | | | |
47 // --------- <--- high for L | |
48 // | | | |
49 // | L | | |
50 // | | | |
51 // | | | |
52 // | | | |
53 // +-------+ <--- low_boundary for L | |
54 // | |
55 // Each virtual space in the AdjoiningVirtualSpaces grows and shrink | |
56 // within its reserved region (between the low_boundary and the | |
57 // boundary) independently. If L want to grow above its high_boundary, | |
58 // then the high_boundary of L and the low_boundary of H must be | |
59 // moved up consistently. AdjoiningVirtualSpaces provide the | |
60 // interfaces for moving the this boundary. | |
61 | |
62 class AdjoiningVirtualSpaces { | |
63 // space at the high end and the low end, respectively | |
64 PSVirtualSpace* _high; | |
65 PSVirtualSpace* _low; | |
66 | |
67 // The reserved space spanned by the two spaces. | |
68 ReservedSpace _reserved_space; | |
69 | |
70 // The minimum byte size for the low space. It will not | |
71 // be shrunk below this value. | |
72 size_t _min_low_byte_size; | |
73 // Same for the high space | |
74 size_t _min_high_byte_size; | |
75 | |
76 const size_t _alignment; | |
77 | |
78 public: | |
79 // Allocates two virtual spaces that will be located at the | |
80 // high and low ends. Does no initialization. | |
81 AdjoiningVirtualSpaces(ReservedSpace rs, | |
82 size_t min_low_byte_size, | |
83 size_t min_high_byte_size, | |
84 size_t alignment); | |
85 | |
86 // accessors | |
87 PSVirtualSpace* high() { return _high; } | |
88 PSVirtualSpace* low() { return _low; } | |
89 ReservedSpace reserved_space() { return _reserved_space; } | |
90 size_t min_low_byte_size() { return _min_low_byte_size; } | |
91 size_t min_high_byte_size() { return _min_high_byte_size; } | |
92 size_t alignment() const { return _alignment; } | |
93 | |
94 // move boundary between the two spaces up | |
95 bool adjust_boundary_up(size_t size_in_bytes); | |
96 // and down | |
97 bool adjust_boundary_down(size_t size_in_bytes); | |
98 | |
99 // Maximum byte size for the high space. | |
100 size_t high_byte_size_limit() { | |
101 return _reserved_space.size() - _min_low_byte_size; | |
102 } | |
103 // Maximum byte size for the low space. | |
104 size_t low_byte_size_limit() { | |
105 return _reserved_space.size() - _min_high_byte_size; | |
106 } | |
107 | |
108 // Sets the boundaries for the virtual spaces and commits and | |
109 // initial size; | |
110 void initialize(size_t max_low_byte_size, | |
111 size_t init_low_byte_size, | |
112 size_t init_high_byte_size); | |
113 }; | |
1972 | 114 |
115 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ADJOININGVIRTUALSPACES_HPP |