linux-kernel - Re: [PATCH v4] sched: fix wrong rq's runnable

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Message-ID: <1365497406.2609.162.camel@laptop>
Date:	Tue, 09 Apr 2013 10:50:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	mingo@...nel.org, pjt@...gle.com, rostedt@...dmis.org,
	fweisbec@...il.com, efault@....de
Subject: Re: [PATCH v4] sched: fix wrong rq's runnable_avg update with rt
 tasks

On Thu, 2013-04-04 at 16:15 +0200, Vincent Guittot wrote:
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> ---
>  kernel/sched/fair.c      |   23 +++++++++++++++++++++--
>  kernel/sched/idle_task.c |   10 ++++++++++
>  kernel/sched/sched.h     |   12 ++++++++++++
>  3 files changed, 43 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 0fcdbff..1851ca8 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -1562,6 +1562,27 @@ static inline void
> dequeue_entity_load_avg(struct cfs_rq *cfs_rq,
>                 se->avg.decay_count =
> atomic64_read(&cfs_rq->decay_counter);
>         } /* migrations, e.g. sleep=0 leave decay_count == 0 */
>  }
> +
> +/*
> + * Update the rq's load with the elapsed running time before entering
> + * idle. if the last scheduled task is not a CFS task, idle_enter
> will
> + * be the only way to update the runnable statistic.
> + */
> +void idle_enter(struct rq *this_rq)
> +{
> +       update_rq_runnable_avg(this_rq, 1);
> +}
> +
> +/*
> + * Update the rq's load with the elapsed idle time before a task is
> + * scheduled. if the newly scheduled task is not a CFS task,
> idle_exit will
> + * be the only way to update the runnable statistic.
> + */
> +void idle_exit(struct rq *this_rq)
> +{
> +       update_rq_runnable_avg(this_rq, 0);
> +}

These seem like fairly unfortunate names to expose to the global
namespace, why not expose update_rq_runnable_avg() instead?


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