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