linux-kernel - Re: [PATCH 6/7] sched/fair: Remove sgs->sum_weighted

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Date:   Mon, 27 May 2019 16:07:02 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Rik van Riel <riel@...riel.com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Quentin Perret <quentin.perret@....com>,
        Valentin Schneider <valentin.schneider@....com>,
        Patrick Bellasi <patrick.bellasi@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] sched/fair: Remove sgs->sum_weighted_load

On Mon, 27 May 2019 at 08:21, Dietmar Eggemann <dietmar.eggemann@....com> wrote:
>
> Since sg_lb_stats::sum_weighted_load is now identical with
> sg_lb_stats::group_load remove it and replace its use case
> (calculating load per task) with the latter.
>
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>

FWIW
Acked-by: Vincent Guittot <vincent.guittot@...aro.org>

> ---
>  kernel/sched/fair.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 88779c45e8e6..a33f196703a7 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7580,7 +7580,6 @@ static unsigned long task_h_load(struct task_struct *p)
>  struct sg_lb_stats {
>         unsigned long avg_load; /*Avg load across the CPUs of the group */
>         unsigned long group_load; /* Total load over the CPUs of the group */
> -       unsigned long sum_weighted_load; /* Weighted load of group's tasks */
>         unsigned long load_per_task;
>         unsigned long group_capacity;
>         unsigned long group_util; /* Total utilization of the group */
> @@ -7947,7 +7946,6 @@ static inline void update_sg_lb_stats(struct lb_env *env,
>                 sgs->nr_numa_running += rq->nr_numa_running;
>                 sgs->nr_preferred_running += rq->nr_preferred_running;
>  #endif
> -               sgs->sum_weighted_load += weighted_cpuload(rq);
>                 /*
>                  * No need to call idle_cpu() if nr_running is not 0
>                  */
> @@ -7966,7 +7964,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
>         sgs->avg_load = (sgs->group_load*SCHED_CAPACITY_SCALE) / sgs->group_capacity;
>
>         if (sgs->sum_nr_running)
> -               sgs->load_per_task = sgs->sum_weighted_load / sgs->sum_nr_running;
> +               sgs->load_per_task = sgs->group_load / sgs->sum_nr_running;
>
>         sgs->group_weight = group->group_weight;
>
> --
> 2.17.1
>