Re: [PATCH 2/2] sched/fair: Delete useless condition in tg_unthrottle_up()

[Benjamin Segall <bsegall@google.com>]

Chengming Zhou <zhouchengming@bytedance.com> writes:

> Fully decayed cfs_rq is impossible to have queued entities,
> the first condition "!cfs_rq_is_decayed(cfs_rq)" is enough
> to cover.

In particular, cfs_rq->load.weight is part of cfs_rq_is_decayed.

Reviewed-by: Ben Segall <bsegall@google.com>

>
> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.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 e6fa5d1141b4..17c13c38b1c2 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -4850,7 +4850,7 @@ static int tg_unthrottle_up(struct task_group *tg, void *data)
>  					     cfs_rq->throttled_clock_task;
>  
>  		/* Add cfs_rq with load or one or more already running entities to the list */
> -		if (!cfs_rq_is_decayed(cfs_rq) || cfs_rq->nr_running)
> +		if (!cfs_rq_is_decayed(cfs_rq))
>  			list_add_leaf_cfs_rq(cfs_rq);
>  	}