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comparison src/os_cpu/linux_x86/vm/os_linux_x86.inline.hpp @ 4749:7ab5f6318694

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7125934: Add a fast unordered timestamp capability to Hotspot on x86/x64 Summary: Add rdtsc detection and inline generation. Reviewed-by: kamg, dholmes Contributed-by: karen.kinnear@oracle.com
author phh
date Sun, 01 Jan 2012 11:17:59 -0500
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children b9a9ed0f8eeb
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4732:4ec93d767458 4749:7ab5f6318694
1 /*
2 * Copyright (c) 2011, 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 OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP
26 #define OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP
27
28 #include "runtime/os.hpp"
29
30 // See http://www.technovelty.org/code/c/reading-rdtsc.htl for details
31 inline jlong os::rdtsc() {
32 #ifndef AMD64
33 // 64 bit result in edx:eax
34 uint64_t res;
35 __asm__ __volatile__ ("rdtsc" : "=A" (res));
36 return (jlong)res;
37 #else
38 uint64_t res;
39 uint32_t ts1, ts2;
40 __asm__ __volatile__ ("rdtsc" : "=a" (ts1), "=d" (ts2));
41 res = ((uint64_t)ts1 | (uint64_t)ts2 << 32);
42 return (jlong)res;
43 #endif // AMD64
44 }
45
46 #endif // OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP