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

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Message-ID: <55497DF4.2060709@google.com>
Date:	Tue, 05 May 2015 19:35:32 -0700
From:	Badhri Jagan Sridharan <badhri@...gle.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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

Thanks for your comments..
Have made the changes that you mentioned in PATCH v2.

On 05/05/2015 06:50 PM, Steven Rostedt wrote:
> 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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