linux-kernel - Re: [PATCH] sched: keep quiescent cpu out of idle balance loop

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Message-ID: <20140220120408.GN27965@twins.programming.kicks-ass.net>
Date:	Thu, 20 Feb 2014 13:04:08 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lei Wen <leiwen@...vell.com>
Cc:	mingo@...hat.com, preeti.lkml@...il.com, daniel.lezcano@...aro.org,
	viresh.kumar@...aro.org, xjian@...vell.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: keep quiescent cpu out of idle balance loop

On Thu, Feb 20, 2014 at 05:17:04PM +0800, Lei Wen wrote:
> Cpu which is put into quiescent mode, would remove itself
> from kernel's sched_domain, and want others not disturb its
> task running. But current scheduler would not checking whether
> that cpu is setting in such mode, and still insist the quiescent
> cpu to response the nohz load balance.
> 
> Fix it by preventing such cpu set nohz.idle_cpus_mask in the
> first place.
> 
> Signed-off-by: Lei Wen <leiwen@...vell.com>

Thanks
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