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

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Message-ID: <20130627193138.GB30433@spo001.leaseweb.com>
Date:	Thu, 27 Jun 2013 21:31:38 +0200
From:	Wim Van Sebroeck <wim@...ana.be>
To:	anish kumar <anish198519851985@...il.com>
Cc:	linux@...ck-us.net, linux-watchdog@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC]Watchdog:core: constant pinging until userspace timesout when delay very less

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?

Kind regards,
Wim.

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