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comparison: src/share/vm/services/memoryUsage.hpp
src/share/vm/services/memoryUsage.hpp
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| 1 /* | |
| 2 * Copyright (c) 2003, 2013, 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; | |
| 50 size_t _used; | |
| 51 size_t _committed; | |
| 52 size_t _maxSize; | |
| 53 | |
| 54 public: | |
| 55 // Constructors | |
| 56 MemoryUsage(size_t i, size_t u, size_t c, size_t m) : | |
| 57 _initSize(i), _used(u), _committed(c), _maxSize(m) {}; | |
| 58 MemoryUsage() : | |
| 59 _initSize(0), _used(0), _committed(0), _maxSize(0) {}; | |
| 60 | |
| 61 size_t init_size() const { return _initSize; } | |
| 62 size_t used() const { return _used; } | |
| 63 size_t committed() const { return _committed; } | |
| 64 size_t max_size() const { return _maxSize; } | |
| 65 | |
| 66 static size_t undefined_size() { return (size_t) -1; } | |
| 67 | |
| 68 inline static jlong convert_to_jlong(size_t val) { | |
| 69 // In the 64-bit vm, a size_t can overflow a jlong (which is signed). | |
| 70 jlong ret; | |
| 71 if (val == undefined_size()) { | |
| 72 ret = -1L; | |
| 73 } else { | |
| 74 NOT_LP64(ret = val;) | |
| 75 LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);) | |
| 76 } | |
| 77 return ret; | |
| 78 } | |
| 79 | |
| 80 jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); } | |
| 81 jlong used_as_jlong() const { return convert_to_jlong(_used); } | |
| 82 jlong committed_as_jlong() const { return convert_to_jlong(_committed); } | |
| 83 jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); } | |
| 84 }; | |
| 85 | |
| 86 #endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP |
