| /* |
| * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_SERVICES_MEMORYUSAGE_HPP |
| #define SHARE_VM_SERVICES_MEMORYUSAGE_HPP |
| |
| #include "utilities/globalDefinitions.hpp" |
| |
| // A memory usage contains the following attributes about memory usage: |
| // initSize - represents the initial amount of memory (in bytes) that |
| // the Java virtual machine requests from the operating system |
| // for memory management. The Java virtual machine may request |
| // additional memory from the operating system later when appropriate. |
| // Its value may be undefined. |
| // used - represents the amount of memory currently used (in bytes). |
| // committed - represents the amount of memory (in bytes) that is |
| // guaranteed to be available for use by the Java virtual machine. |
| // The amount of committed memory may change over time (increase |
| // or decrease). It is guaranteed to be greater than or equal |
| // to initSize. |
| // maxSize - represents the maximum amount of memory (in bytes) |
| // that can be used for memory management. The maximum amount of |
| // memory for memory management could be less than the amount of |
| // committed memory. Its value may be undefined. |
| |
| class MemoryUsage VALUE_OBJ_CLASS_SPEC { |
| private: |
| size_t _initSize; |
| size_t _used; |
| size_t _committed; |
| size_t _maxSize; |
| |
| public: |
| // Constructors |
| MemoryUsage(size_t i, size_t u, size_t c, size_t m) : |
| _initSize(i), _used(u), _committed(c), _maxSize(m) {}; |
| MemoryUsage() : |
| _initSize(0), _used(0), _committed(0), _maxSize(0) {}; |
| |
| size_t init_size() const { return _initSize; } |
| size_t used() const { return _used; } |
| size_t committed() const { return _committed; } |
| size_t max_size() const { return _maxSize; } |
| |
| static size_t undefined_size() { return (size_t) -1; } |
| |
| inline static jlong convert_to_jlong(size_t val) { |
| // In the 64-bit vm, a size_t can overflow a jlong (which is signed). |
| jlong ret; |
| if (val == undefined_size()) { |
| ret = -1L; |
| } else { |
| NOT_LP64(ret = val;) |
| LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);) |
| } |
| return ret; |
| } |
| |
| jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); } |
| jlong used_as_jlong() const { return convert_to_jlong(_used); } |
| jlong committed_as_jlong() const { return convert_to_jlong(_committed); } |
| jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); } |
| }; |
| |
| #endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP |