linux-kernel - Re: [PATCH] [RFC]Watchdog:core: constant pinging until userspace timesout when delay very less

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Message-ID: <CAK7N6vo6u74o4Bz3P6Nxr8vHxbV2Z41eGC1Z9yYjcZBTy_i_CQ@mail.gmail.com>
Date:	Fri, 28 Jun 2013 09:01:36 +0530
From:	anish singh <anish198519851985@...il.com>
To:	Wim Van Sebroeck <wim@...ana.be>
Cc:	Guenter Roeck <linux@...ck-us.net>, linux-watchdog@...r.kernel.org,
	linux-kernel-mail <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [RFC]Watchdog:core: constant pinging until userspace
 timesout when delay very less

On Fri, Jun 28, 2013 at 1:01 AM, Wim Van Sebroeck <wim@...ana.be> wrote:
> Hi Anish,
>
>> Certain watchdog drivers use a timer to keep kicking the watchdog at
>> a rate of 0.5s (HZ/2) untill userspace times out.They do this as
>> we can't guarantee that watchdog will be pinged fast enough
>> for all system loads, especially if timeout is configured for
>> less than or equal to 1 second(basically small values).
>>
>> As suggested by Wim Van Sebroeck & Guenter Roeck we should
>> add this functionality of individual watchdog drivers in the core
>> watchdog core.
>
> Have you considered the effect this change has on all watchdog drivers
> that don't need a timer?
No,I will drop this patch.
>
> Kind regards,
> Wim.
>
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