Mercurial > hg > graal-compiler
view src/share/vm/services/memoryUsage.hpp @ 3405:8cbcd406c42e
7042740: CMS: assert(n> q) failed: Looping at: ... blockOffsetTable.cpp:557
Summary: Do a one-step look-ahead, when sweeping free or garbage blocks, to avoid overstepping sweep limit, which may become a non-block-boundary because of a heap expansion delta coalescing with a previously co-terminal free block.
Reviewed-by: brutisso, tonyp
author | ysr |
---|---|
date | Fri, 27 May 2011 15:05:33 -0700 |
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