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SubjectRe: [PATCH RESEND] timer stats: reset entries when disable the timer usage statistics
On 10/09/2013 07:59 PM, Dong Zhu wrote:
> From f41628c61d8a9172677ba33a55b61e37ce28f7a6 Mon Sep 17 00:00:00 2001
> From: Dong Zhu <bluezhudong@gmail.com>
> Date: Thu, 10 Oct 2013 10:38:13 +0800
>
> When we stop timer statistics collection (via echo 0 >
> /proc/timers_stats), the statistics data is still exported as if it were
> correct, which can cause applicaitons to misuse the statistics.
>
> This patch resets the statistics when we stop collecting them, to avoid
> this problem.
>
> Signed-off-by: Dong Zhu <bluezhudong@gmail.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();

This looks ok to me. Thomas, do you have any objections here?

thanks
-john



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