linux-kernel - Re: NMI watchdog + NOHZ question

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Message-ID: <20090624102325.GN6760@one.firstfloor.org>
Date:	Wed, 24 Jun 2009 12:23:25 +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

> And similarly to sparc64, if that 5+ second qla2xxx interrupt
> sequence happens after the tick_nohz_stop_sched_tick() call
> we can run into the same situation.

Yes it would be probably safer to do the tick disabling with interrupts off
already.

These days NMI watchdog is not used much on x86 anymore because it's 
default off, so probably people never noticed that.

-Andi

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