linux-kernel - Re: [PATCH v4 11/11] sched/fair: rework find_idlest

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Date:   Mon, 25 Nov 2019 11:13:00 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Phil Auld <pauld@...hat.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>,
        Hillf Danton <hdanton@...a.com>,
        Parth Shah <parth@...ux.ibm.com>,
        Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH v4 11/11] sched/fair: rework find_idlest_group

On 25/11/2019 09:59, Vincent Guittot wrote:
>>> +     case group_imbalanced:
>>> +     case group_asym_packing:
>>> +             /* Those type are not used in the slow wakeup path */
>>> +             return NULL;
>>
>> I suppose group_asym_packing could be handled similarly to misfit, right?
>> i.e. make the group type group_asym_packing if
>>
>>   !sched_asym_prefer(sg.asym_prefer_cpu, local.asym_prefer_cpu)
> 
> Unlike group_misfit_task that was somehow already taken into account
> through the comparison of spare capacity, group_asym_packing was not
> considered at all in find_idlest_group so I prefer to stay
> conservative and wait for users of asym_packing to come with a need
> before adding this new mechanism.
> 

Right, makes sense.