linux-kernel - Re: [PATCH 1/8] sched & trace: Add a trace event for wait.

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Date:	Tue, 15 Apr 2014 15:49:16 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
Cc:	rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
	acme@...stprotocols.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] sched & trace: Add a trace event for wait.

On Tue, Apr 15, 2014 at 09:32:50PM +0900, Dongsheng Yang wrote:
> From: Dongsheng <yangds.fnst@...fujitsu.com>
> 

No changelog, and the tracepoint seems useless to me.

> Signed-off-by: Dongsheng <yangds.fnst@...fujitsu.com>
> ---
>  include/trace/events/sched.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
> index 67e1bbf..7aa7d43a 100644
> --- a/include/trace/events/sched.h
> +++ b/include/trace/events/sched.h
> @@ -51,6 +51,26 @@ TRACE_EVENT(sched_kthread_stop_ret,
>  );
>  
>  /*
> + * Tracepoint for wait:
> + */
> +TRACE_EVENT(sched_wait,
> +
> +	TP_PROTO(struct task_struct *p),
> +
> +	TP_ARGS(p),
> +
> +	TP_STRUCT__entry(
> +		__field(	pid_t,	pid	)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->pid	= p->pid;
> +	),
> +
> +	TP_printk("pid=%d", __entry->pid)
> +);
> +
> +/*
>   * Tracepoint for waking up a task:
>   */
>  DECLARE_EVENT_CLASS(sched_wakeup_template,
> -- 
> 1.8.2.1
> 
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