linux-kernel - Re: [PATCH v2] sched/fair: Fix insertion in rq->leaf_cfs_rq

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Date:   Wed, 30 Jan 2019 16:48:47 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
        Sargun Dhillon <sargun@...gun.me>
Subject: Re: [PATCH v2] sched/fair: Fix insertion in rq->leaf_cfs_rq_list

On Wed, 30 Jan 2019 at 14:40, Peter Zijlstra <peterz@...radead.org> wrote:
>

>
>  static inline void list_del_leaf_cfs_rq(struct cfs_rq *cfs_rq)
> @@ -352,7 +354,12 @@ static inline void list_del_leaf_cfs_rq(struct cfs_rq *cfs_rq)
>         }
>  }
>
> -/* Iterate through all leaf cfs_rq's on a runqueue: */
> +static inline void assert_list_leaf_cfs_rq(struct rq *rq)
> +{
> +       SCHED_WARN_ON(rq->tmp_alone_branch != &rq->lead_cfs_rq_list);

small typo : s/lead_cfs_rq_list/leaf_cfs_rq_list/

> +}
> +
> +/* Iterate through all cfs_rq's on a runqueue in bottom-up order */
>  #define for_each_leaf_cfs_rq(rq, cfs_rq) \
>         list_for_each_entry_rcu(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list)
>
> @@ -446,6 +453,10 @@ static inline void list_del_leaf_cfs_rq(struct cfs_rq *cfs_rq)
>  {
>  }
>
> +static inline void assert_list_leaf_cfs_rq(struct rq *rq)
> +{
> +}
> +
>  #define for_each_leaf_cfs_rq(rq, cfs_rq)       \
>                 for (cfs_rq = &rq->cfs; cfs_rq; cfs_rq = NULL)
>
> @@ -5179,6 +5190,8 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
>
>         }
>
> +       assert_list_leaf_cfs_rq(rq);
> +
>         hrtick_update(rq);
>  }
>