linux-kernel - Re: [PATCH 2/3] watchdog: Document watchdog

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Date:	Fri, 17 May 2013 09:07:00 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] watchdog: Document watchdog_thresh sysctl

On Fri, May 17, 2013 at 10:31:20AM +0800, Li Zefan wrote:
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

Acked-by: Don Zickus <dzickus@...hat.com>

> ---
>  Documentation/sysctl/kernel.txt | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
> index ccd4258..e8fabd6 100644
> --- a/Documentation/sysctl/kernel.txt
> +++ b/Documentation/sysctl/kernel.txt
> @@ -76,6 +76,7 @@ show up in /proc/sys/kernel:
>  - tainted
>  - threads-max
>  - unknown_nmi_panic
> +- watchdog_thresh
>  - version
>  
>  ==============================================================
> @@ -648,3 +649,16 @@ that time, kernel debugging information is displayed on console.
>  
>  NMI switch that most IA32 servers have fires unknown NMI up, for
>  example.  If a system hangs up, try pressing the NMI switch.
> +
> +==============================================================
> +
> +watchdog_thresh:
> +
> +This value can be used to control the frequency of hrtimer and NMI
> +events and the soft and hard lockup thresholds. The default threshold
> +is 10 seconds.
> +
> +The softlockup threshold is (2 * watchdog_thresh). Setting this
> +tunable to zero will disable lockup detection altogether.
> +
> +==============================================================
> -- 
> 1.8.0.2
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