linux-kernel - Re: [PATCH 2/3] ftrace: add tracepoint for hrtimer

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Message-ID: <4A1CEE27.3010805@cn.fujitsu.com>
Date:	Wed, 27 May 2009 15:39:19 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	mingo@...e.hu, LKML <linux-kernel@...r.kernel.org>,
	Zhaolei <zhaolei@...fujitsu.com>, kosaki.motohiro@...fujitsu.com,
	Steven Rostedt <rostedt@...dmis.org>, fweisbec@...il.com
Subject: Re: [PATCH 2/3] ftrace: add tracepoint for hrtimer



Thomas Gleixner wrote:
> On Fri, 22 May 2009, Xiao Guangrong wrote:
>> +TRACE_EVENT(hrtimer_start,
>> +
>> +	TP_PROTO(struct hrtimer *timer),
>> +
>> +	TP_ARGS(timer),
>> +
>> +	TP_STRUCT__entry(
>> +		__field( void *,	timer		)
>> +		__field( void *,	function	)
>> +		__field( s64,		expires		)
>> +		__field( s64,		softexpires	)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__entry->timer		= timer;
>> +		__entry->function	= timer->function;
>> +		__entry->expires	= ktime_to_ns(hrtimer_get_expires(timer));
>> +		__entry->softexpires	= ktime_to_ns(hrtimer_get_softexpires(timer));
>> +	),
> 
>   Yuck, we really do not want expensive conversions in the fast
>   path. This can be done by printk or user space tools.
> 

Yes, you are right. I'will correct it.

>> @@ -1119,6 +1122,7 @@ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
>>  {
>>  	debug_hrtimer_init(timer);
>>  	__hrtimer_init(timer, clock_id, mode);
>> +	trace_hrtimer_init(timer, clock_id, mode);
> 
>   The comments I made about the timer.c tracepoints vs. debugobjects
>   apply here as well.
> 
> Thanks,
> 
> 	tglx
> 
> 
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