linux-kernel - Re: [PATCH] android: binder: Remove deprecated create_singlethread

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Message-ID: <20160815230018.GH3672@mtj.duckdns.org>
Date:	Mon, 15 Aug 2016 19:00:18 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] android: binder: Remove deprecated
 create_singlethread_workqueue

On Sat, Aug 13, 2016 at 10:16:24PM +0530, Bhaktipriya Shridhar wrote:
> The workqueue is being used to run deferred work for the android binder.
> 
> The "binder_deferred_workqueue" queues only a single work item and hence
> does not require ordering. Also, this workqueue is not being used on a
> memory recliam 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.
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@...il.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun