linux-kernel - Re: [PATCH] kernel/fork.c: define reset_task

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Message-Id: <20090226145346.8a778d98.akpm@linux-foundation.org>
Date:	Thu, 26 Feb 2009 14:53:46 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Gustavo F. Padovan" <gustavo@....ic.unicamp.br>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/fork.c: define reset_task_cputimes()

On Thu, 26 Feb 2009 02:17:55 -0300
"Gustavo F. Padovan" <gustavo@....ic.unicamp.br> wrote:

> Group all vars that receive cputime_zero in the same static function.
> This also cleans the code.
> 
> Signed-off-by: Gustavo F. Padovan <gustavo@....ic.unicamp.br>
> ---
>  include/linux/sched.h |   11 +++++++++++
>  kernel/fork.c         |    8 +-------
>  2 files changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 8981e52..1a64587 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1595,6 +1595,17 @@ extern cputime_t task_utime(struct task_struct *p);
>  extern cputime_t task_stime(struct task_struct *p);
>  extern cputime_t task_gtime(struct task_struct *p);
>  
> +static inline void reset_task_cputimes(struct task_struct *t)
> +{
> +	t->utime = cputime_zero;
> +	t->stime = cputime_zero;
> +	t->gtime = cputime_zero;
> +	t->utimescaled = cputime_zero;
> +	t->stimescaled = cputime_zero;
> +	t->prev_utime = cputime_zero;
> +	t->prev_stime = cputime_zero;
> +}
> +
>  /*
>   * Per process flags
>   */
> diff --git a/kernel/fork.c b/kernel/fork.c
> index a66fbde..9856abe 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -1031,13 +1031,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
>  	clear_tsk_thread_flag(p, TIF_SIGPENDING);
>  	init_sigpending(&p->pending);
>  
> -	p->utime = cputime_zero;
> -	p->stime = cputime_zero;
> -	p->gtime = cputime_zero;
> -	p->utimescaled = cputime_zero;
> -	p->stimescaled = cputime_zero;
> -	p->prev_utime = cputime_zero;
> -	p->prev_stime = cputime_zero;
> +	reset_task_cputimes(p);
>  
>  	p->default_timer_slack_ns = current->timer_slack_ns;
>  

I cannot see much point in doing this, unless you have some other patch
which adds a second caller of reset_task_cputimes()?


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