jdk8-mips64-public/hotspot: src/share/vm/runtime/prefetch.hpp@2b8e28fdf503

     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

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    25 #ifndef SHARE_VM_RUNTIME_PREFETCH_HPP

    26 #define SHARE_VM_RUNTIME_PREFETCH_HPP

    28 #include "memory/allocation.hpp"

    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.

    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   };

    44   // Prefetch anticipating read; must not fault, semantically a no-op

    45   static void read(void* loc, intx interval);

    47   // Prefetch anticipating write; must not fault, semantically a no-op

    48   static void write(void* loc, intx interval);

    49 };

    51 #endif // SHARE_VM_RUNTIME_PREFETCH_HPP

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