linux-kernel - Re: [PATCH 3/3] softlockup: fix watchdog task wakeup frequency

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Date:	Fri, 27 Jun 2008 14:03:50 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Johannes Weiner <hannes@...urebad.de>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 3/3] softlockup: fix watchdog task wakeup frequency


* Johannes Weiner <hannes@...urebad.de> wrote:

> Wake up the watchdog every second instead of every second. [...]

now _that_ is a real improvement ;-)

>  	/* Wake up the high-prio watchdog task every second: */
> -	if (now > (touch_timestamp + 1))
> +	if (now > touch_timestamp)
>  		wake_up_process(per_cpu(watchdog_task, this_cpu));

you mean wake up every second instead of every two seconds?

i think the best sleep period for the watchdog is half of the threshold. 
It makes no point to check sooner than that. I.e. softlockup_thresh/2 
would be better?

	Ingo
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