linux-kernel - Re: [PATCH 4/7 v3] sched: propagate load during synchronous attach/detach

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Message-ID: <20160915175455.GI5012@twins.programming.kicks-ass.net>
Date:   Thu, 15 Sep 2016 19:54:55 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>, mingo@...nel.org,
        linux-kernel@...r.kernel.org, yuyang.du@...el.com,
        Morten.Rasmussen@....com, linaro-kernel@...ts.linaro.org,
        pjt@...gle.com, bsegall@...gle.com
Subject: Re: [PATCH 4/7 v3] sched: propagate load during synchronous
 attach/detach

On Thu, Sep 15, 2016 at 06:36:53PM +0100, Dietmar Eggemann wrote:

> > We did however loose a lot on why and how min(1, runnable_avg) is a
> > sensible thing to do...
> 
> Do you refer to the big comment on top of this if condition in the old
> code in __update_group_entity_contrib()? The last two subsections of it
> I never understood ...
> 
> [...]

Read the thread here:

  http://www.gossamer-threads.com/lists/linux/kernel/1558210

But Vince's explanation earlier is also good.