1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/services/memoryUsage.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,86 @@
1.4 +/*
1.5 + * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_SERVICES_MEMORYUSAGE_HPP
1.29 +#define SHARE_VM_SERVICES_MEMORYUSAGE_HPP
1.30 +
1.31 +#include "utilities/globalDefinitions.hpp"
1.32 +
1.33 +// A memory usage contains the following attributes about memory usage:
1.34 +// initSize - represents the initial amount of memory (in bytes) that
1.35 +// the Java virtual machine requests from the operating system
1.36 +// for memory management. The Java virtual machine may request
1.37 +// additional memory from the operating system later when appropriate.
1.38 +// Its value may be undefined.
1.39 +// used - represents the amount of memory currently used (in bytes).
1.40 +// committed - represents the amount of memory (in bytes) that is
1.41 +// guaranteed to be available for use by the Java virtual machine.
1.42 +// The amount of committed memory may change over time (increase
1.43 +// or decrease). It is guaranteed to be greater than or equal
1.44 +// to initSize.
1.45 +// maxSize - represents the maximum amount of memory (in bytes)
1.46 +// that can be used for memory management. The maximum amount of
1.47 +// memory for memory management could be less than the amount of
1.48 +// committed memory. Its value may be undefined.
1.49 +
1.50 +class MemoryUsage VALUE_OBJ_CLASS_SPEC {
1.51 +private:
1.52 + size_t _initSize;
1.53 + size_t _used;
1.54 + size_t _committed;
1.55 + size_t _maxSize;
1.56 +
1.57 +public:
1.58 + // Constructors
1.59 + MemoryUsage(size_t i, size_t u, size_t c, size_t m) :
1.60 + _initSize(i), _used(u), _committed(c), _maxSize(m) {};
1.61 + MemoryUsage() :
1.62 + _initSize(0), _used(0), _committed(0), _maxSize(0) {};
1.63 +
1.64 + size_t init_size() const { return _initSize; }
1.65 + size_t used() const { return _used; }
1.66 + size_t committed() const { return _committed; }
1.67 + size_t max_size() const { return _maxSize; }
1.68 +
1.69 + static size_t undefined_size() { return (size_t) -1; }
1.70 +
1.71 + inline static jlong convert_to_jlong(size_t val) {
1.72 + // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
1.73 + jlong ret;
1.74 + if (val == undefined_size()) {
1.75 + ret = -1L;
1.76 + } else {
1.77 + NOT_LP64(ret = val;)
1.78 + LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);)
1.79 + }
1.80 + return ret;
1.81 + }
1.82 +
1.83 + jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); }
1.84 + jlong used_as_jlong() const { return convert_to_jlong(_used); }
1.85 + jlong committed_as_jlong() const { return convert_to_jlong(_committed); }
1.86 + jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); }
1.87 +};
1.88 +
1.89 +#endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP
