linux-kernel - Re: [RFC PATCH 00/32] Nohz cpusets (was: Nohz Tasks)

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Message-ID: <4E4BEE1F.9060500@redhat.com>
Date:	Wed, 17 Aug 2011 09:36:47 -0700
From:	Avi Kivity <avi@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephen Hemminger <shemminger@...tta.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 00/32] Nohz cpusets (was: Nohz Tasks)

On 08/15/2011 08:51 AM, Frederic Weisbecker wrote:
> = What's the interface =
>
> We use the cpuset interface by adding a nohz flag to it.
> As long as a CPU is part of a nohz cpuset, then this CPU will
> try to enter into adaptive nohz mode when it can, even if it is part
> of another cpuset that is not nohz.
>
>

Why not do it unconditionally?  That is, if all the conditions are 
fulfilled, disable the tick regardless of any cpuset settings.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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