linux-kernel - Re: [PATCH] sched/fair: Fix decision matrix of type misfit

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Message-ID: <05c87803-59d3-2b3f-80ab-47b418c3f10f@arm.com>
Date:   Mon, 25 Apr 2022 11:01:14 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     zgpeng <zgpeng.linux@...il.com>, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, rostedt@...dmis.org,
        bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/fair: Fix decision matrix of type misfit_task

On 24/04/2022 09:56, zgpeng wrote:
> When the group type of the busiest is misfit_task, as
> long as the type of the local group is not equal to
> has_spare, those situation already filtered while
> updating statistics.
> 
> Signed-off-by: zgpeng <zgpeng@...cent.com>
> Reviewed-by: Samuel Liao <samuelliao@...cent.com>
> ---
>  kernel/sched/fair.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index d4bd299..b8c67e7 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -9495,7 +9495,7 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
>   * busiest \ local has_spare fully_busy misfit asym imbalanced overloaded
>   * has_spare        nr_idle   balanced   N/A    N/A  balanced   balanced
>   * fully_busy       nr_idle   nr_idle    N/A    N/A  balanced   balanced
> - * misfit_task      force     N/A        N/A    N/A  force      force
> + * misfit_task      force     N/A        N/A    N/A  N/A        N/A
>   * asym_packing     force     force      N/A    N/A  force      force
>   * imbalanced       force     force      N/A    N/A  force      force
>   * overloaded       force     force      N/A    N/A  force      avg_load

This issue has been sorted. Patch from Tao Zhou <tao.zhou@...ux.dev> is
already on tip sched/core.

https://lkml.kernel.org/r/165062326028.4207.17060214721845047142.tip-bot2@tip-bot2