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From:   Valentin Schneider <valentin.schneider@arm.com>
To:     Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Qais Yousef <qais.yousef@arm.com>
Cc:     linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Quentin Perret <qperret@google.com>,
        Pavan Kondeti <pkondeti@codeaurora.org>,
        Rik van Riel <riel@surriel.com>
Subject: Re: [PATCH 7/8] sched/fair: Attempt misfit active balance when migration_type != migrate_misfit
In-Reply-To: <aefdb891-8567-4ebc-4308-336159feb305@arm.com>
References: <20210128183141.28097-1-valentin.schneider@arm.com> <20210128183141.28097-8-valentin.schneider@arm.com> <20210203151647.ygvlktrivpw4a7qh@e107158-lin> <jhjk0rp2drv.mognet@arm.com> <aefdb891-8567-4ebc-4308-336159feb305@arm.com>
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Date:   Thu, 04 Feb 2021 12:22:29 +0000
Message-ID: <jhj7dno2fay.mognet@arm.com>
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On 04/02/21 12:44, Dietmar Eggemann wrote:
> On 03/02/2021 19:43, Valentin Schneider wrote:
>> On 03/02/21 15:16, Qais Yousef wrote:
>>> On 01/28/21 18:31, Valentin Schneider wrote:
>>>> Giving group_misfit_task a higher group_classify() priority than
>>>> group_imbalance doesn't seem like the right thing to do. Instead, make
>>>> need_active_balance() return true for any migration_type when the
>>>
>>> s/need_active_balance()/voluntary_active_balance()/?
>>>
>>>> destination CPU is idle and the source CPU has a misfit task.
>>>>
>>>> While at it, add an sd_has_asym_cpucapacity() guard in
>>>> need_active_balance().
>>>
>>> ditto.
>>>
>> 
>> Myes, clearly this has been left to ferment for too long!
>
> Wasn't the migrate_misfit condition moved from
> voluntary_active_balance() into need_active_balance() by commit
> ("sched/fair: Reduce cases for active balance")?

Bah, you're right, I got confused with when I first wrote that vs when I
last updated the changelog.

As of

  e9b9734b7465 ("sched/fair: Reduce cases for active balance")e9b9734b7465

The above changelog is actually correct.