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src/share/vm/services/memoryUsage.hpp@710a3c8b516e (annotated)
src/share/vm/services/memoryUsage.hpp
Tue, 08 Aug 2017 15:57:29 +0800
- author
- aoqi
- date
- Tue, 08 Aug 2017 15:57:29 +0800
- changeset 6876
- 710a3c8b516e
- parent 6198
- 55fb97c4c58d
- parent 0
- f90c822e73f8
- permissions
- -rw-r--r--
merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_SERVICES_MEMORYUSAGE_HPP |
| aoqi@0 | 26 | #define SHARE_VM_SERVICES_MEMORYUSAGE_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "utilities/globalDefinitions.hpp" |
| aoqi@0 | 29 | |
| aoqi@0 | 30 | // A memory usage contains the following attributes about memory usage: |
| aoqi@0 | 31 | // initSize - represents the initial amount of memory (in bytes) that |
| aoqi@0 | 32 | // the Java virtual machine requests from the operating system |
| aoqi@0 | 33 | // for memory management. The Java virtual machine may request |
| aoqi@0 | 34 | // additional memory from the operating system later when appropriate. |
| aoqi@0 | 35 | // Its value may be undefined. |
| aoqi@0 | 36 | // used - represents the amount of memory currently used (in bytes). |
| aoqi@0 | 37 | // committed - represents the amount of memory (in bytes) that is |
| aoqi@0 | 38 | // guaranteed to be available for use by the Java virtual machine. |
| aoqi@0 | 39 | // The amount of committed memory may change over time (increase |
| aoqi@0 | 40 | // or decrease). It is guaranteed to be greater than or equal |
| aoqi@0 | 41 | // to initSize. |
| aoqi@0 | 42 | // maxSize - represents the maximum amount of memory (in bytes) |
| aoqi@0 | 43 | // that can be used for memory management. The maximum amount of |
| aoqi@0 | 44 | // memory for memory management could be less than the amount of |
| aoqi@0 | 45 | // committed memory. Its value may be undefined. |
| aoqi@0 | 46 | |
| aoqi@0 | 47 | class MemoryUsage VALUE_OBJ_CLASS_SPEC { |
| aoqi@0 | 48 | private: |
| aoqi@0 | 49 | size_t _initSize; |
| aoqi@0 | 50 | size_t _used; |
| aoqi@0 | 51 | size_t _committed; |
| aoqi@0 | 52 | size_t _maxSize; |
| aoqi@0 | 53 | |
| aoqi@0 | 54 | public: |
| aoqi@0 | 55 | // Constructors |
| aoqi@0 | 56 | MemoryUsage(size_t i, size_t u, size_t c, size_t m) : |
| aoqi@0 | 57 | _initSize(i), _used(u), _committed(c), _maxSize(m) {}; |
| aoqi@0 | 58 | MemoryUsage() : |
| aoqi@0 | 59 | _initSize(0), _used(0), _committed(0), _maxSize(0) {}; |
| aoqi@0 | 60 | |
| aoqi@0 | 61 | size_t init_size() const { return _initSize; } |
| aoqi@0 | 62 | size_t used() const { return _used; } |
| aoqi@0 | 63 | size_t committed() const { return _committed; } |
| aoqi@0 | 64 | size_t max_size() const { return _maxSize; } |
| aoqi@0 | 65 | |
| aoqi@0 | 66 | static size_t undefined_size() { return (size_t) -1; } |
| aoqi@0 | 67 | |
| aoqi@0 | 68 | inline static jlong convert_to_jlong(size_t val) { |
| aoqi@0 | 69 | // In the 64-bit vm, a size_t can overflow a jlong (which is signed). |
| aoqi@0 | 70 | jlong ret; |
| aoqi@0 | 71 | if (val == undefined_size()) { |
| aoqi@0 | 72 | ret = -1L; |
| aoqi@0 | 73 | } else { |
| aoqi@0 | 74 | NOT_LP64(ret = val;) |
| aoqi@0 | 75 | LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);) |
| aoqi@0 | 76 | } |
| aoqi@0 | 77 | return ret; |
| aoqi@0 | 78 | } |
| aoqi@0 | 79 | |
| aoqi@0 | 80 | jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); } |
| aoqi@0 | 81 | jlong used_as_jlong() const { return convert_to_jlong(_used); } |
| aoqi@0 | 82 | jlong committed_as_jlong() const { return convert_to_jlong(_committed); } |
| aoqi@0 | 83 | jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); } |
| aoqi@0 | 84 | }; |
| aoqi@0 | 85 | |
| aoqi@0 | 86 | #endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP |
