linux-kernel - Re: [patch 08/15] sched: throttle cfs_rq entities which exceed their local runtime

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Date:	Mon, 16 May 2011 17:58:15 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Nikhil Rao <ncrao@...gle.com>
Subject: Re: [patch 08/15] sched: throttle cfs_rq entities which exceed
 their local runtime

On Tue, 2011-05-03 at 02:28 -0700, Paul Turner wrote:
> +       /*
> +        * it's possible active load balance has forced a throttled cfs_rq to
> +        * run again, we don't want to re-throttled in this case.
> +        */
> +       if (cfs_rq_throttled(cfs_rq))
> +               return; 

expand a little on this, why would load-balancing interact with a
throttled group? load-balancing should fully ignore these things,
they're not runnable after all.
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