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1 /*
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2 * Copyright 2003-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // A memory usage contains the following attributes about memory usage:
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26 // initSize - represents the initial amount of memory (in bytes) that
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27 // the Java virtual machine requests from the operating system
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28 // for memory management. The Java virtual machine may request
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29 // additional memory from the operating system later when appropriate.
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30 // Its value may be undefined.
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31 // used - represents the amount of memory currently used (in bytes).
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32 // committed - represents the amount of memory (in bytes) that is
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33 // guaranteed to be available for use by the Java virtual machine.
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34 // The amount of committed memory may change over time (increase
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35 // or decrease). It is guaranteed to be greater than or equal
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36 // to initSize.
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37 // maxSize - represents the maximum amount of memory (in bytes)
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38 // that can be used for memory management. The maximum amount of
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39 // memory for memory management could be less than the amount of
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40 // committed memory. Its value may be undefined.
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41
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42 class MemoryUsage VALUE_OBJ_CLASS_SPEC {
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43 private:
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44 size_t _initSize;
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45 size_t _used;
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46 size_t _committed;
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47 size_t _maxSize;
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48
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49 public:
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50 // Constructors
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51 MemoryUsage(size_t i, size_t u, size_t c, size_t m) :
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52 _initSize(i), _used(u), _committed(c), _maxSize(m) {};
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53 MemoryUsage() :
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54 _initSize(0), _used(0), _committed(0), _maxSize(0) {};
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55
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56 size_t init_size() const { return _initSize; }
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57 size_t used() const { return _used; }
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58 size_t committed() const { return _committed; }
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59 size_t max_size() const { return _maxSize; }
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60
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61 inline static jlong convert_to_jlong(size_t val) {
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62 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
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63 jlong ret;
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64 if (val == (size_t)-1) {
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65 ret = -1L;
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66 } else {
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67 NOT_LP64(ret = val;)
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68 LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);)
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69 }
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70 return ret;
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71 }
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72
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73 jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); }
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74 jlong used_as_jlong() const { return convert_to_jlong(_used); }
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75 jlong committed_as_jlong() const { return convert_to_jlong(_committed); }
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76 jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); }
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77 };
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