1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/share/vm/runtime/prefetch.hpp Sat Dec 01 00:00:00 2007 +0000 1.3 @@ -0,0 +1,44 @@ 1.4 +/* 1.5 + * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or 1.24 + * have any questions. 1.25 + * 1.26 + */ 1.27 + 1.28 +// If calls to prefetch methods are in a loop, the loop should be cloned 1.29 +// such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval 1.30 +// say not to do prefetching, these methods aren't called. At the very 1.31 +// least, they take up a memory issue slot. They should be implemented 1.32 +// as inline assembly code: doing an actual call isn't worth the cost. 1.33 + 1.34 +class Prefetch : AllStatic { 1.35 + public: 1.36 + enum style { 1.37 + do_none, // Do no prefetching 1.38 + do_read, // Do read prefetching 1.39 + do_write // Do write prefetching 1.40 + }; 1.41 + 1.42 + // Prefetch anticipating read; must not fault, semantically a no-op 1.43 + static void read(void* loc, intx interval); 1.44 + 1.45 + // Prefetch anticipating write; must not fault, semantically a no-op 1.46 + static void write(void* loc, intx interval); 1.47 +};