linux-kernel - Re: NMI watchdog + NOHZ question

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Message-ID: <20090624071555.GK6760@one.firstfloor.org>
Date:	Wed, 24 Jun 2009 09:15:55 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	andi@...stfloor.org, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org
Subject: Re: NMI watchdog + NOHZ question

On Wed, Jun 24, 2009 at 12:08:11AM -0700, David Miller wrote:
> From: Andi Kleen <andi@...stfloor.org>
> Date: Wed, 24 Jun 2009 09:03:15 +0200
> 
> >> I'm not exactly sure what to do about this.
> > 
> > Ack the timer interrupt earlier (and also give it a high priority?)
> 
> It has a higher priority, but all interrupts get re-enabled right
> before we process software interrupts.  So the flood of qla2xxx
> interrupts can come in before we can run the timer softirq and
> thus schedule the next timer interrupt.

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?

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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