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comparison src/share/vm/runtime/prefetch.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // If calls to prefetch methods are in a loop, the loop should be cloned
26 // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval
27 // say not to do prefetching, these methods aren't called. At the very
28 // least, they take up a memory issue slot. They should be implemented
29 // as inline assembly code: doing an actual call isn't worth the cost.
30
31 class Prefetch : AllStatic {
32 public:
33 enum style {
34 do_none, // Do no prefetching
35 do_read, // Do read prefetching
36 do_write // Do write prefetching
37 };
38
39 // Prefetch anticipating read; must not fault, semantically a no-op
40 static void read(void* loc, intx interval);
41
42 // Prefetch anticipating write; must not fault, semantically a no-op
43 static void write(void* loc, intx interval);
44 };