linux-kernel - Re: [PATCH] timer stats: reset entries when disable the timer usage statistics

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Date:	Thu, 20 Jun 2013 18:30:48 +0800
From:	Dong Zhu <bluezhudong@...il.com>
To:	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] timer stats: reset entries when disable the timer
 usage statistics

On Mon, Jun 10, 2013 at 03:57:45PM +0800, Dong Zhu wrote:
> From 4dbb760213856dc382241db456c1c6487694837c Mon Sep 17 00:00:00 2001
> From: Dong Zhu <bluezhudong@...il.com>
> Date: Mon, 10 Jun 2013 15:09:27 +0800
> 
> we can start/stop data collection by using :
> echo [1|0] > /proc/timer_stats
> when we stop the data collection,hrtimer will not update the statistics
> for a timer any more,but we could still check the timer usage
> statistics,unfortunately the data is not the latest, the inaccurate data
> might make us confusing. So the purpose of this patch is to reset the
> entries once disable operation is executed.In this way we will never
> see the inaccurate timer usage statistics.
> 
> Signed-off-by: Dong Zhu <bluezhudong@...il.com>
> ---
>  kernel/time/timer_stats.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c
> index 0b537f2..43f05e7 100644
> --- a/kernel/time/timer_stats.c
> +++ b/kernel/time/timer_stats.c
> @@ -371,6 +371,7 @@ static ssize_t tstats_write(struct file *file, const char __user *buf,
>  	switch (ctl[0]) {
>  	case '0':
>  		if (timer_stats_active) {
> +			reset_entries();
>  			timer_stats_active = 0;
>  			time_stop = ktime_get();
>  			sync_access();
> -- 
> 1.7.11.7

Hi all,

Any comments here ?

-- 
Best Regards,
Dong Zhu
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