linux-kernel - Re: [PATCH] tracing: timer: Add deferrable flag to timer

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Date:	Tue, 5 May 2015 21:50:59 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Badhri Jagan Sridharan <badhri@...gle.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing: timer: Add deferrable flag to timer_start

On Tue,  5 May 2015 18:04:53 -0700
Badhri Jagan Sridharan <badhri@...gle.com> wrote:

> The timer_start event now shows whether the timer is
> deferrable in case of a low-res timer. The debug_activate
> function now includes deferrable flag while calling
> trace_timer_start event.
> 
> Signed-off-by: Badhri Jagan Sridharan <Badhri@...gle.com>
> ---
>  include/trace/events/timer.h | 11 +++++++----
>  kernel/time/timer.c          |  3 ++-
>  2 files changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
> index 68c2c20..9b15f89 100644
> --- a/include/trace/events/timer.h
> +++ b/include/trace/events/timer.h
> @@ -43,15 +43,17 @@ DEFINE_EVENT(timer_class, timer_init,
>   */
>  TRACE_EVENT(timer_start,
>  
> -	TP_PROTO(struct timer_list *timer, unsigned long expires),
> +	TP_PROTO(struct timer_list *timer,
> +		unsigned long expires, char deferrable),
>  
> -	TP_ARGS(timer, expires),
> +	TP_ARGS(timer, expires, deferrable),
>  
>  	TP_STRUCT__entry(
>  		__field( void *,	timer		)
>  		__field( void *,	function	)
>  		__field( unsigned long,	expires		)
>  		__field( unsigned long,	now		)
> +		__field(char,	deferrable)

Fix indentation here too.

>  	),
>  
>  	TP_fast_assign(
> @@ -59,11 +61,12 @@ TRACE_EVENT(timer_start,
>  		__entry->function	= timer->function;
>  		__entry->expires	= expires;
>  		__entry->now		= jiffies;
> +		__entry->deferrable     = deferrable;
>  	),
>  
> -	TP_printk("timer=%p function=%pf expires=%lu [timeout=%ld]",
> +	TP_printk("timer=%p function=%pf expires=%lu [timeout=%ld] defer=%c",
>  		  __entry->timer, __entry->function, __entry->expires,
> -		  (long)__entry->expires - __entry->now)
> +		  (long)__entry->expires - __entry->now, __entry->deferrable)

Should pass in tbase_get_deferrable(), and do the characters here
(slight optimization).

	__entry->deferrable > 0 ? 'y' : 'n')


>  );
>  
>  /**
> diff --git a/kernel/time/timer.c b/kernel/time/timer.c
> index 2ece3aa..2b906b5 100644
> --- a/kernel/time/timer.c
> +++ b/kernel/time/timer.c
> @@ -648,7 +648,8 @@ static inline void
>  debug_activate(struct timer_list *timer, unsigned long expires)
>  {
>  	debug_timer_activate(timer);
> -	trace_timer_start(timer, expires);
> +	trace_timer_start(timer, expires,
> +		tbase_get_deferrable(timer->base) > 0 ? 'y' : 'n');

Then this should just be;

	trace_timer_start(timer, expires,
		tbase_get_deferrable(timer->base));

-- Steve

>  }
>  
>  static inline void debug_deactivate(struct timer_list *timer)

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