87 lines
3.4 KiB
C++
87 lines
3.4 KiB
C++
/*
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_SERVICES_MEMORYUSAGE_HPP
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#define SHARE_VM_SERVICES_MEMORYUSAGE_HPP
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#include "utilities/globalDefinitions.hpp"
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// A memory usage contains the following attributes about memory usage:
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// initSize - represents the initial amount of memory (in bytes) that
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// the Java virtual machine requests from the operating system
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// for memory management. The Java virtual machine may request
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// additional memory from the operating system later when appropriate.
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// Its value may be undefined.
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// used - represents the amount of memory currently used (in bytes).
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// committed - represents the amount of memory (in bytes) that is
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// guaranteed to be available for use by the Java virtual machine.
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// The amount of committed memory may change over time (increase
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// or decrease). It is guaranteed to be greater than or equal
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// to initSize.
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// maxSize - represents the maximum amount of memory (in bytes)
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// that can be used for memory management. The maximum amount of
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// memory for memory management could be less than the amount of
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// committed memory. Its value may be undefined.
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class MemoryUsage {
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private:
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size_t _initSize;
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size_t _used;
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size_t _committed;
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size_t _maxSize;
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public:
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// Constructors
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MemoryUsage(size_t i, size_t u, size_t c, size_t m) :
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_initSize(i), _used(u), _committed(c), _maxSize(m) {};
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MemoryUsage() :
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_initSize(0), _used(0), _committed(0), _maxSize(0) {};
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size_t init_size() const { return _initSize; }
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size_t used() const { return _used; }
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size_t committed() const { return _committed; }
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size_t max_size() const { return _maxSize; }
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static size_t undefined_size() { return (size_t) -1; }
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inline static jlong convert_to_jlong(size_t val) {
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// In the 64-bit vm, a size_t can overflow a jlong (which is signed).
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jlong ret;
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if (val == undefined_size()) {
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ret = -1L;
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} else {
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NOT_LP64(ret = val;)
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LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);)
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}
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return ret;
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}
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jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); }
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jlong used_as_jlong() const { return convert_to_jlong(_used); }
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jlong committed_as_jlong() const { return convert_to_jlong(_committed); }
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jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); }
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};
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#endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP
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