linux-kernel - Re: [PATCH] tracing: Use task_nice() in function __update_max

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Message-ID: <20140122225632.73c2fbdf@gandalf.local.home>
Date:	Wed, 22 Jan 2014 22:56:32 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, fweisbec@...il.com, mingo@...hat.com
Subject: Re: [PATCH] tracing: Use task_nice() in function __update_max_tr()
 to get the nice value of task.

On Wed, 22 Jan 2014 17:41:45 -0500
Dongsheng Yang <yangds.fnst@...fujitsu.com> wrote:

> There is already a function named task_nice in sched.h to get the nice value
> of task_struct. We can use it in __update_max_tr() rather than calculate it
> manually.
> 
> Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
> ---
>  kernel/trace/trace.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 9d20cd9..ec149b4 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -970,7 +970,7 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
>  	else
>  		max_data->uid = task_uid(tsk);
>  
> -	max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
> +	max_data->nice = task_nice(tsk);

Except that's a function call in a critical path. Switch it to
TASK_NICE(), and I'll take the patch.

Thanks,

-- Steve

>  	max_data->policy = tsk->policy;
>  	max_data->rt_priority = tsk->rt_priority;
>  

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