Mercurial > hg > truffle
view src/share/vm/runtime/prefetch.hpp @ 3769:ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
Summary: It turns out that there is no need to explicitly stop CMS since the JVM is taken down at a terminal safepoint during which CMS threads are (terminally) inactive. This will need to be revised if and when we evolve in the future to a point where we allow JVM reincarnation in the same process, but those changes will be much more sweeping than just terminating CMS threads. The unused ::stop() methods will be removed in a separate CR. Also include in this CR is the fix for a small typo in the spelling of UseGCLogFileRotation in a message in arguments.cpp, brought to our attention by Rainer Jung and reviewed by minqi.
Reviewed-by: johnc, jwilhelm
author | ysr |
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date | Mon, 13 Jun 2011 09:58:16 -0700 |
parents | f95d63e2154a |
children |
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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_RUNTIME_PREFETCH_HPP #define SHARE_VM_RUNTIME_PREFETCH_HPP #include "memory/allocation.hpp" // If calls to prefetch methods are in a loop, the loop should be cloned // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval // say not to do prefetching, these methods aren't called. At the very // least, they take up a memory issue slot. They should be implemented // as inline assembly code: doing an actual call isn't worth the cost. class Prefetch : AllStatic { public: enum style { do_none, // Do no prefetching do_read, // Do read prefetching do_write // Do write prefetching }; // Prefetch anticipating read; must not fault, semantically a no-op static void read(void* loc, intx interval); // Prefetch anticipating write; must not fault, semantically a no-op static void write(void* loc, intx interval); }; #endif // SHARE_VM_RUNTIME_PREFETCH_HPP