linux-kernel - Re: [PATCH] fbdev: Remove deprecated create_singlethread

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Date:	Wed, 10 Aug 2016 13:44:18 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
CC:	Tejun Heo <tj@...nel.org>, <linux-fbdev@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fbdev: Remove deprecated create_singlethread_workqueue



On 02/07/16 11:39, Bhaktipriya Shridhar wrote:
> The workqueue "esd_wq" has only a single workitem(&md->esd_work)
> and hence doesn't require ordering. Also, it is not being used on a
> memory reclaim path. Hence, the singlethreaded workqueue has been
> replaced with the use of system_wq.
> 
> System workqueues have been able to handle high level of concurrency
> for a long time now and hence it's not required to have a singlethreaded
> workqueue just to gain concurrency. Unlike a dedicated per-cpu workqueue
> created with create_singlethread_workqueue(), system_wq allows multiple
> work items to overlap executions even on the same CPU; however, a
> per-cpu workqueue doesn't have any CPU locality or global ordering
> guarantee unless the target CPU is explicitly specified and thus the
> increase of local concurrency shouldn't make any difference.
> 
> mipid_esd_stop_check () calls cancel_delayed_work() in mipid_cleanup()
> to ensure that there are no pending tasks while disconnecting the driver.
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@...il.com>
> ---
>  drivers/video/fbdev/omap/lcd_mipid.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)

Thanks, queued for v4.9.

 Tomi



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