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src/share/vm/runtime/prefetch.hpp@eef07cd490d4 (annotated)
src/share/vm/runtime/prefetch.hpp
Wed, 03 Jul 2019 20:42:37 +0800
- author
- aoqi
- date
- Wed, 03 Jul 2019 20:42:37 +0800
- changeset 9637
- eef07cd490d4
- parent 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
Merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_RUNTIME_PREFETCH_HPP |
| aoqi@0 | 26 | #define SHARE_VM_RUNTIME_PREFETCH_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "memory/allocation.hpp" |
| aoqi@0 | 29 | |
| aoqi@0 | 30 | // If calls to prefetch methods are in a loop, the loop should be cloned |
| aoqi@0 | 31 | // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval |
| aoqi@0 | 32 | // say not to do prefetching, these methods aren't called. At the very |
| aoqi@0 | 33 | // least, they take up a memory issue slot. They should be implemented |
| aoqi@0 | 34 | // as inline assembly code: doing an actual call isn't worth the cost. |
| aoqi@0 | 35 | |
| aoqi@0 | 36 | class Prefetch : AllStatic { |
| aoqi@0 | 37 | public: |
| aoqi@0 | 38 | enum style { |
| aoqi@0 | 39 | do_none, // Do no prefetching |
| aoqi@0 | 40 | do_read, // Do read prefetching |
| aoqi@0 | 41 | do_write // Do write prefetching |
| aoqi@0 | 42 | }; |
| aoqi@0 | 43 | |
| aoqi@0 | 44 | // Prefetch anticipating read; must not fault, semantically a no-op |
| aoqi@0 | 45 | static void read(void* loc, intx interval); |
| aoqi@0 | 46 | |
| aoqi@0 | 47 | // Prefetch anticipating write; must not fault, semantically a no-op |
| aoqi@0 | 48 | static void write(void* loc, intx interval); |
| aoqi@0 | 49 | }; |
| aoqi@0 | 50 | |
| aoqi@0 | 51 | #endif // SHARE_VM_RUNTIME_PREFETCH_HPP |
