linux-kernel - Re: [PATCH] sched,nohz: Change rq->nr

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Message-ID: <20140509091214.GM30445@twins.programming.kicks-ass.net>
Date:	Fri, 9 May 2014 11:12:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	linux-kernel@...r.kernel.org, fweisbec@...il.com, mingo@...nel.org
Subject: Re: [PATCH] sched,nohz: Change rq->nr_running always using wrappers

On Fri, May 09, 2014 at 03:00:14AM +0400, Kirill Tkhai wrote:
> Sometimes nr_running may cross 2 but interrupt is not being
> sent to rq's cpu. In this case we don't reenable timer.
> Looks like, this may be a reason of rare unexpected effects,
> if nohz is enabled.
> 
> Patch replaces all places of direct changing of nr_running
> and makes add_nr_running() caring about crossing border.
> 
> Signed-off-by: Kirill Tkhai <tkhai@...dex.ru>
> CC: Frederic Weisbecker <fweisbec@...il.com>
> CC: Peter Zijlstra <peterz@...radead.org>
> CC: Ingo Molnar <mingo@...nel.org>

Thanks!

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