linux-kernel - Re: [PATCH 4/5] workqueue: use system_highpri_wq for highpri workers in rebind

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Date:	Mon, 13 Aug 2012 09:34:52 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] workqueue: use system_highpri_wq for highpri
 workers in rebind_workers()

On Tue, Aug 14, 2012 at 01:17:51AM +0900, Joonsoo Kim wrote:
> In rebind_workers(), we do inserting a work to rebind to cpu for busy workers.
> Currently, in this case, we use only system_wq. This makes a possible
> error situation as there is mismatch between cwq->pool and worker->pool.
> 
> To prevent this, we should use system_highpri_wq for highpri worker
> to match theses. This implements it.
> 
> Signed-off-by: Joonsoo Kim <js1304@...il.com>
> 
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index f69f094..e0e1d41 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -489,6 +489,11 @@ static int worker_pool_pri(struct worker_pool *pool)
>  	return pool - pool->gcwq->pools;
>  }
>  
> +static struct workqueue_struct *get_pool_system_wq(struct worker_pool *pool)
> +{
> +	return worker_pool_pri(pool) ? system_highpri_wq : system_wq;
> +}
> +
>  static struct global_cwq *get_gcwq(unsigned int cpu)
>  {
>  	if (cpu != WORK_CPU_UNBOUND)
> @@ -1450,9 +1455,10 @@ retry:
>  
>  		/* wq doesn't matter, use the default one */
>  		debug_work_activate(rebind_work);
> -		insert_work(get_cwq(gcwq->cpu, system_wq), rebind_work,
> -			    worker->scheduled.next,
> -			    work_color_to_flags(WORK_NO_COLOR));
> +		insert_work(
> +			get_cwq(gcwq->cpu, get_pool_system_wq(worker->pool)),
> +			rebind_work, worker->scheduled.next,
> +			work_color_to_flags(WORK_NO_COLOR));

I think it would be better to just opencode system_wq selection in
rebind_workers().

Thanks.

-- 
tejun
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