linux-kernel - Re: [PATCH] sched: fix spurious active migration

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Message-ID: <CAKfTPtAfyHL_aq8cEdeOzvRh_OaBFuv1_5uqTQG9soh=AR1zqA@mail.gmail.com>
Date:	Tue, 30 Sep 2014 11:38:21 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [PATCH] sched: fix spurious active migration

On 30 September 2014 10:41, Vincent Guittot <vincent.guittot@...aro.org> wrote:
> Since commit caeb178c60f4 ("sched/fair: Make update_sd_pick_busiest() ...")

As someone asked me on IRC, I want to clarify that this commit is not
yet in mainline but in tip/sched/core branch

> sd_pick_busiest returns a group that can be neither imbalanced nor overloaded
> but is only more loaded than others. This change has been introduced to ensure
> a better load balance in system that are not overloaded but as a side effect,
> it can also generate useless active migration between groups.
>

[snip]
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