Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/runtime/prefetch.hpp
src/share/vm/runtime/prefetch.hpp
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| 1 /* | |
| 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_RUNTIME_PREFETCH_HPP | |
| 26 #define SHARE_VM_RUNTIME_PREFETCH_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 | |
| 30 // If calls to prefetch methods are in a loop, the loop should be cloned | |
| 31 // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval | |
| 32 // say not to do prefetching, these methods aren't called. At the very | |
| 33 // least, they take up a memory issue slot. They should be implemented | |
| 34 // as inline assembly code: doing an actual call isn't worth the cost. | |
| 35 | |
| 36 class Prefetch : AllStatic { | |
| 37 public: | |
| 38 enum style { | |
| 39 do_none, // Do no prefetching | |
| 40 do_read, // Do read prefetching | |
| 41 do_write // Do write prefetching | |
| 42 }; | |
| 43 | |
| 44 // Prefetch anticipating read; must not fault, semantically a no-op | |
| 45 static void read(void* loc, intx interval); | |
| 46 | |
| 47 // Prefetch anticipating write; must not fault, semantically a no-op | |
| 48 static void write(void* loc, intx interval); | |
| 49 }; | |
| 50 | |
| 51 #endif // SHARE_VM_RUNTIME_PREFETCH_HPP |
