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Don't unconditionally use clock_gettime vsyscall on x86-64

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This commit is contained in:
Ulrich Drepper 2011-09-06 21:34:11 -04:00
parent d53a73acdb
commit a77d3c17dc
5 changed files with 40 additions and 16 deletions
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11
ChangeLog
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@ -1,5 +1,16 @@
2011-09-06 Ulrich Drepper <drepper@gmail.com>
* sysdeps/unix/sysv/linux/x86_64/clock_gettime.c: New file.
* sysdeps/unix/sysv/linux/clock_gettime.c (SYSCALL_GETTIME): Allow
already be defined. Change to take two parameters and don't assign
result to variable. Adjust all users.
Define INTERNAL_GETTIME if not already defined.
Use INTERNAL_GETTIME instead of INTERNAL_VSYSCALL got clock_gettime
call.
* sysdeps/unix/sysv/linux/x86_64/sysdep.h: Don't define
HAVE_CLOCK_GETTIME_VSYSCALL.
* sysdeps/unix/clock_gettime.c: Adjust use of SYSDEP_GETTIME_CPU.
* sysdeps/unix/sysv/linux/getsysstats.c (__get_nprocs): Don't use
gettimeofday vsyscall, just use time.

4
sysdeps/unix/clock_gettime.c
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@ -1,5 +1,5 @@
/* clock_gettime -- Get the current time from a POSIX clockid_t. Unix version.
Copyright (C) 1999-2004, 2005, 2007 Free Software Foundation, Inc.
Copyright (C) 1999-2004, 2005, 2007, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -113,7 +113,7 @@ clock_gettime (clockid_t clock_id, struct timespec *tp)
default:
#ifdef SYSDEP_GETTIME_CPU
SYSDEP_GETTIME_CPU;
retval = SYSDEP_GETTIME_CPU (clock_id, tp);
#endif
#if HP_TIMING_AVAIL
if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1))

20
sysdeps/unix/sysv/linux/clock_gettime.c
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@ -1,5 +1,5 @@
/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version.
Copyright (C) 2003,2004,2005,2006,2007,2010 Free Software Foundation, Inc.
Copyright (C) 2003,2004,2005,2006,2007,2010,2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -32,9 +32,14 @@
# include <bits/libc-vdso.h>
#endif
#define SYSCALL_GETTIME \
retval = INLINE_VSYSCALL (clock_gettime, 2, clock_id, tp); \
break
#ifndef SYSCALL_GETTIME
# define SYSCALL_GETTIME(id, tp) \
INLINE_VSYSCALL (clock_gettime, 2, id, tp)
#endif
#ifndef INTERNAL_GETTIME
# define INTERNAL_GETTIME(id, tp) \
INTERNAL_VSYSCALL (clock_gettime, err, 2, id, tp)
#endif
#ifdef __ASSUME_POSIX_TIMERS
@ -44,7 +49,8 @@
SYSDEP_GETTIME_CPUTIME \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
SYSCALL_GETTIME
retval = SYSCALL_GETTIME (clock_id, tp); \
break
# define __libc_missing_posix_timers 0
#elif defined __NR_clock_gettime
@ -59,7 +65,7 @@ maybe_syscall_gettime (clockid_t clock_id, struct timespec *tp)
if (!__libc_missing_posix_timers)
{
INTERNAL_SYSCALL_DECL (err);
int r = INTERNAL_VSYSCALL (clock_gettime, err, 2, clock_id, tp);
int r = INTERNAL_GETTIME (clock_id, tp);
if (!INTERNAL_SYSCALL_ERROR_P (r, err))
return 0;
@ -119,7 +125,7 @@ maybe_syscall_gettime_cpu (clockid_t clock_id, struct timespec *tp)
if (!__libc_missing_posix_cpu_timers)
{
INTERNAL_SYSCALL_DECL (err);
int r = INTERNAL_VSYSCALL (clock_gettime, err, 2, clock_id, tp);
int r = INTERNAL_GETTIME (clock_id, tp);
if (!INTERNAL_SYSCALL_ERROR_P (r, err))
return 0;

10
sysdeps/unix/sysv/linux/x86_64/clock_gettime.c Normal file
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@ -0,0 +1,10 @@
#include "bits/libc-vdso.h"
#ifdef SHARED
# define SYSCALL_GETTIME(id, tp) \
(*__vdso_clock_gettime) (id, tp)
# define INTERNAL_GETTIME(id, tp) \
(*__vdso_clock_gettime) (id, tp)
#endif
#include "../clock_gettime.c"

5
sysdeps/unix/sysv/linux/x86_64/sysdep.h
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@ -1,4 +1,4 @@
/* Copyright (C) 2001-2005, 2007 Free Software Foundation, Inc.
/* Copyright (C) 2001-2005, 2007, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -304,9 +304,6 @@
v_ret; \
})
/* List of system calls which are supported as vsyscalls. */
# define HAVE_CLOCK_GETTIME_VSYSCALL 1
# else
# define INLINE_VSYSCALL(name, nr, args...) \
INLINE_SYSCALL (name, nr, ##args)