1 /*
2 * Copyright (c) 2003, 2005, 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 *
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;
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 };
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1 /*
2 * Copyright (c) 2003, 2010, 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 *
23 */
24
25 #ifndef SHARE_VM_SERVICES_MEMORYUSAGE_HPP
26 #define SHARE_VM_SERVICES_MEMORYUSAGE_HPP
27
28 #include "utilities/globalDefinitions.hpp"
29
30 // A memory usage contains the following attributes about memory usage:
31 // initSize - represents the initial amount of memory (in bytes) that
32 // the Java virtual machine requests from the operating system
33 // for memory management. The Java virtual machine may request
34 // additional memory from the operating system later when appropriate.
35 // Its value may be undefined.
36 // used - represents the amount of memory currently used (in bytes).
37 // committed - represents the amount of memory (in bytes) that is
38 // guaranteed to be available for use by the Java virtual machine.
39 // The amount of committed memory may change over time (increase
40 // or decrease). It is guaranteed to be greater than or equal
41 // to initSize.
42 // maxSize - represents the maximum amount of memory (in bytes)
43 // that can be used for memory management. The maximum amount of
44 // memory for memory management could be less than the amount of
45 // committed memory. Its value may be undefined.
46
47 class MemoryUsage VALUE_OBJ_CLASS_SPEC {
48 private:
49 size_t _initSize;
63 size_t committed() const { return _committed; }
64 size_t max_size() const { return _maxSize; }
65
66 inline static jlong convert_to_jlong(size_t val) {
67 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
68 jlong ret;
69 if (val == (size_t)-1) {
70 ret = -1L;
71 } else {
72 NOT_LP64(ret = val;)
73 LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);)
74 }
75 return ret;
76 }
77
78 jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); }
79 jlong used_as_jlong() const { return convert_to_jlong(_used); }
80 jlong committed_as_jlong() const { return convert_to_jlong(_committed); }
81 jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); }
82 };
83
84 #endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP
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