aoqi@0: /* aoqi@0: * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. aoqi@0: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. aoqi@0: * aoqi@0: * This code is free software; you can redistribute it and/or modify it aoqi@0: * under the terms of the GNU General Public License version 2 only, as aoqi@0: * published by the Free Software Foundation. aoqi@0: * aoqi@0: * This code is distributed in the hope that it will be useful, but WITHOUT aoqi@0: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or aoqi@0: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License aoqi@0: * version 2 for more details (a copy is included in the LICENSE file that aoqi@0: * accompanied this code). aoqi@0: * aoqi@0: * You should have received a copy of the GNU General Public License version aoqi@0: * 2 along with this work; if not, write to the Free Software Foundation, aoqi@0: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. aoqi@0: * aoqi@0: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA aoqi@0: * or visit www.oracle.com if you need additional information or have any aoqi@0: * questions. aoqi@0: * aoqi@0: */ aoqi@0: aoqi@0: #ifndef SHARE_VM_RUNTIME_PREFETCH_HPP aoqi@0: #define SHARE_VM_RUNTIME_PREFETCH_HPP aoqi@0: aoqi@0: #include "memory/allocation.hpp" aoqi@0: aoqi@0: // If calls to prefetch methods are in a loop, the loop should be cloned aoqi@0: // such that if Prefetch{Scan,Copy}Interval and/or PrefetchFieldInterval aoqi@0: // say not to do prefetching, these methods aren't called. At the very aoqi@0: // least, they take up a memory issue slot. They should be implemented aoqi@0: // as inline assembly code: doing an actual call isn't worth the cost. aoqi@0: aoqi@0: class Prefetch : AllStatic { aoqi@0: public: aoqi@0: enum style { aoqi@0: do_none, // Do no prefetching aoqi@0: do_read, // Do read prefetching aoqi@0: do_write // Do write prefetching aoqi@0: }; aoqi@0: aoqi@0: // Prefetch anticipating read; must not fault, semantically a no-op aoqi@0: static void read(void* loc, intx interval); aoqi@0: aoqi@0: // Prefetch anticipating write; must not fault, semantically a no-op aoqi@0: static void write(void* loc, intx interval); aoqi@0: }; aoqi@0: aoqi@0: #endif // SHARE_VM_RUNTIME_PREFETCH_HPP