Mercurial > hg > truffle
comparison src/share/vm/services/memoryUsage.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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1 /* | |
2 * Copyright 2003-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // A memory usage contains the following attributes about memory usage: | |
26 // initSize - represents the initial amount of memory (in bytes) that | |
27 // the Java virtual machine requests from the operating system | |
28 // for memory management. The Java virtual machine may request | |
29 // additional memory from the operating system later when appropriate. | |
30 // Its value may be undefined. | |
31 // used - represents the amount of memory currently used (in bytes). | |
32 // committed - represents the amount of memory (in bytes) that is | |
33 // guaranteed to be available for use by the Java virtual machine. | |
34 // The amount of committed memory may change over time (increase | |
35 // or decrease). It is guaranteed to be greater than or equal | |
36 // to initSize. | |
37 // maxSize - represents the maximum amount of memory (in bytes) | |
38 // that can be used for memory management. The maximum amount of | |
39 // memory for memory management could be less than the amount of | |
40 // committed memory. Its value may be undefined. | |
41 | |
42 class MemoryUsage VALUE_OBJ_CLASS_SPEC { | |
43 private: | |
44 size_t _initSize; | |
45 size_t _used; | |
46 size_t _committed; | |
47 size_t _maxSize; | |
48 | |
49 public: | |
50 // Constructors | |
51 MemoryUsage(size_t i, size_t u, size_t c, size_t m) : | |
52 _initSize(i), _used(u), _committed(c), _maxSize(m) {}; | |
53 MemoryUsage() : | |
54 _initSize(0), _used(0), _committed(0), _maxSize(0) {}; | |
55 | |
56 size_t init_size() const { return _initSize; } | |
57 size_t used() const { return _used; } | |
58 size_t committed() const { return _committed; } | |
59 size_t max_size() const { return _maxSize; } | |
60 | |
61 inline static jlong convert_to_jlong(size_t val) { | |
62 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). | |
63 jlong ret; | |
64 if (val == (size_t)-1) { | |
65 ret = -1L; | |
66 } else { | |
67 NOT_LP64(ret = val;) | |
68 LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);) | |
69 } | |
70 return ret; | |
71 } | |
72 | |
73 jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); } | |
74 jlong used_as_jlong() const { return convert_to_jlong(_used); } | |
75 jlong committed_as_jlong() const { return convert_to_jlong(_committed); } | |
76 jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); } | |
77 }; |