linux-kernel - Re: [PATCH] sched/fair: fix statistics for find_idlest

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Message-ID: <20200218150937.GD14914@hirez.programming.kicks-ass.net>
Date:   Tue, 18 Feb 2020 16:09:37 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     mingo@...hat.com, juri.lelli@...hat.com, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        linux-kernel@...r.kernel.org, pauld@...hat.com,
        parth@...ux.ibm.com, valentin.schneider@....com, hdanton@...a.com,
        quentin.perret@....com, srikar@...ux.vnet.ibm.com,
        riel@...riel.com, Morten.Rasmussen@....com
Subject: Re: [PATCH] sched/fair: fix statistics for find_idlest_group()

On Tue, Feb 18, 2020 at 03:45:34PM +0100, Vincent Guittot wrote:
> sgs->group_weight is not set while gathering statistics in
> update_sg_wakeup_stats(). This means that a group can be classified as
> fully busy with 0 running tasks if utilization is high enough.
> 
> This path is mainly used for fork and exec.
> 
> Fixes: 57abff067a08 ("sched/fair: Rework find_idlest_group()")
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>

Thanks!