Mercurial > hg > graal-compiler
view src/share/vm/services/memoryUsage.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | f95d63e2154a |
children | 73d0d0218068 |
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/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_SERVICES_MEMORYUSAGE_HPP #define SHARE_VM_SERVICES_MEMORYUSAGE_HPP #include "utilities/globalDefinitions.hpp" // A memory usage contains the following attributes about memory usage: // initSize - represents the initial amount of memory (in bytes) that // the Java virtual machine requests from the operating system // for memory management. The Java virtual machine may request // additional memory from the operating system later when appropriate. // Its value may be undefined. // used - represents the amount of memory currently used (in bytes). // committed - represents the amount of memory (in bytes) that is // guaranteed to be available for use by the Java virtual machine. // The amount of committed memory may change over time (increase // or decrease). It is guaranteed to be greater than or equal // to initSize. // maxSize - represents the maximum amount of memory (in bytes) // that can be used for memory management. The maximum amount of // memory for memory management could be less than the amount of // committed memory. Its value may be undefined. class MemoryUsage VALUE_OBJ_CLASS_SPEC { private: size_t _initSize; size_t _used; size_t _committed; size_t _maxSize; public: // Constructors MemoryUsage(size_t i, size_t u, size_t c, size_t m) : _initSize(i), _used(u), _committed(c), _maxSize(m) {}; MemoryUsage() : _initSize(0), _used(0), _committed(0), _maxSize(0) {}; size_t init_size() const { return _initSize; } size_t used() const { return _used; } size_t committed() const { return _committed; } size_t max_size() const { return _maxSize; } inline static jlong convert_to_jlong(size_t val) { // In the 64-bit vm, a size_t can overflow a jlong (which is signed). jlong ret; if (val == (size_t)-1) { ret = -1L; } else { NOT_LP64(ret = val;) LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);) } return ret; } jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); } jlong used_as_jlong() const { return convert_to_jlong(_used); } jlong committed_as_jlong() const { return convert_to_jlong(_committed); } jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); } }; #endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP