linux-kernel - Re: [PATCH] fix granularity of task

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Date:	Wed, 11 Nov 2009 13:11:51 +0100
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Spencer Candland <spencer@...ehost.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH] fix granularity of task_u/stime()

Hi Hidetoshi 

On Tue, Nov 10, 2009 at 02:47:34PM +0900, Hidetoshi Seto wrote:
> Remove casting to clock_t from task_u/stime(), and keep granularity of
> cputime_t over the calculation.
> 
> Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
> ---
>  kernel/sched.c |   21 ++++++++++++---------
>  1 files changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 28dd4f4..1632e82 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -5171,41 +5171,44 @@ cputime_t task_stime(struct task_struct *p)
>  	return p->stime;
>  }
>  #else
> +
> +#ifndef nsecs_to_cputime
> +# define nsecs_to_cputime(__nsecs) msecs_to_cputime((__nsecs) / NSEC_PER_MSEC)
> +#endif
> +

I would like to test, but unfortunately with the patch kernel not build
on my system:

kernel/built-in.o: In function `task_utime':
/usr/src/rhel5/linux-2.6/kernel/sched.c:5187: undefined reference to
`__udivdi3'
kernel/built-in.o: In function `task_stime':
/usr/src/rhel5/linux-2.6/kernel/sched.c:5208: undefined reference to
`__udivdi3'
make: *** [.tmp_vmlinux1] Error 1

Cheers
Stanislaw
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