linux-kernel - Re: [PATCH V6] sched/fair: Remove group imbalance from calculate

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Message-ID: <634c755a-8a6c-c90a-21c1-6562becc11be@arm.com>
Date:   Fri, 28 Jul 2017 14:34:19 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Jeffrey Hugo <jhugo@...eaurora.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Austin Christ <austinwc@...eaurora.org>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        Timur Tabi <timur@...eaurora.org>
Subject: Re: [PATCH V6] sched/fair: Remove group imbalance from
 calculate_imbalance()

On 28/07/17 13:59, Peter Zijlstra wrote:
> On Fri, Jul 28, 2017 at 01:16:24PM +0100, Dietmar Eggemann wrote:
>>>> IIRC the topology you had in mind was MC + DIE level with n (n > 2) DIE
>>>> level sched groups.

[...]

>>> If I then start a 3rd loop, I see 100% 50%,50%. I then kill the 100%.
>>> Then instantly they balance and I get 2x100% back.
>>
>> Yeah, could reproduce on IVB-EP (2x10x2).
> 
> OK, I have one of those. What should I do, because I didn't actually see
> anything odd.

Me neither. Sorry, I was unclear. I meant I could reproduce your
example, that one of the 50% task moves to the idle cpu on this machine.

[...]