linux-kernel - Re: [powerpc][5.13.0-rc7] Kernel warning (kernel/sched/fair.c:401) while running LTP tests

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Message-ID: <CAFpoUr1hyAeFSCvyJU4SKjtEKn6Hq1RLuu1eZPhRt1SaAq7=TQ@mail.gmail.com>
Date:   Mon, 21 Jun 2021 18:45:15 +0200
From:   Odin Ugedal <odin@...d.al>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Odin Ugedal <odin@...d.al>,
        Sachin Sant <sachinp@...ux.vnet.ibm.com>,
        open list <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [powerpc][5.13.0-rc7] Kernel warning (kernel/sched/fair.c:401)
 while running LTP tests

man. 21. jun. 2021 kl. 18:22 skrev Vincent Guittot <vincent.guittot@...aro.org>:
> I would prefer that we use the reason of adding the cfs in the list instead.
>
> Something like the below should also fixed the problem. It is based on a
> proposal I made to Rik sometimes ago when he tried to flatten the rq:
> https://lore.kernel.org/lkml/20190906191237.27006-6-riel@surriel.com/
>
> This will ensure that a cfs is added in the list whenever one of its  child
> is still in the list.

Oh, yeah, that is a much more elegant solution! It fixes the issue as well!

Feel free to add this when/if you submit it as a patch:
Acked-by: Odin Ugedal <odin@...d.al>

Odin