linux-kernel - Re: [RFC PATCH 12/15] clocksource: Ignore nohz task cpu in clocksource watchdog

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Message-ID: <1292862458.5021.39.camel@laptop>
Date:	Mon, 20 Dec 2010 17:27:38 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 12/15] clocksource: Ignore nohz task cpu in
 clocksource watchdog

On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote:
> 
> The watchdog should probably make an exception for nohz task cpus
> that want to be interrupted the least possible.
> 
> However we probably need to warn the user about that.
> 
> Another solution would be to make this timer defferable.

Nah, both skipping a cpu and making the timer deferrable render the
watchdog useless, just disable the thing.
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