1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/prefetch.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,51 @@
1.4 +/*
1.5 + * Copyright (c) 2003, 2010, 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_RUNTIME_PREFETCH_HPP
1.29 +#define SHARE_VM_RUNTIME_PREFETCH_HPP
1.30 +
1.31 +#include "memory/allocation.hpp"
1.32 +
1.33 +// If calls to prefetch methods are in a loop, the loop should be cloned
1.34 +// such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval
1.35 +// say not to do prefetching, these methods aren't called. At the very
1.36 +// least, they take up a memory issue slot. They should be implemented
1.37 +// as inline assembly code: doing an actual call isn't worth the cost.
1.38 +
1.39 +class Prefetch : AllStatic {
1.40 + public:
1.41 + enum style {
1.42 + do_none, // Do no prefetching
1.43 + do_read, // Do read prefetching
1.44 + do_write // Do write prefetching
1.45 + };
1.46 +
1.47 + // Prefetch anticipating read; must not fault, semantically a no-op
1.48 + static void read(void* loc, intx interval);
1.49 +
1.50 + // Prefetch anticipating write; must not fault, semantically a no-op
1.51 + static void write(void* loc, intx interval);
1.52 +};
1.53 +
1.54 +#endif // SHARE_VM_RUNTIME_PREFETCH_HPP
