linux-kernel - Re: NMI watchdog + NOHZ question

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Message-Id: <20090624.015126.193707604.davem@davemloft.net>
Date:	Wed, 24 Jun 2009 01:51:26 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: NMI watchdog + NOHZ question

From: Andi Kleen <andi@...stfloor.org>
Date: Wed, 24 Jun 2009 09:53:42 +0200

>> > Ah you have a one shot timer and it gets rescheduled in the softirq?
>> > If yes why not in doing that directly in the hardirq handler?
>> 
>> Then what's the point of the generic timer code supporting one-shot
>> clock sources? :-)
> 
> Well it would avoid that problem at least (I think based on your
> description). Somehow you need to reschedule the timer before the softirq.
> 
> I guess you could have a generic function that is callable from hardirq
> directly?

I'll think a bit more about this, thanks Andi.
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