linux-kernel - Re: [Xen-devel] [PATCH v2] xen: xenbus: Remove create

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Date:	Wed, 29 Jun 2016 13:50:14 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	"Juergen Gross" <jgross@...e.com>
CC:	Tejun Heo <tj@...nel.org>, <xen-devel@...ts.xenproject.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH v2] xen: xenbus: Remove create_workqueue

On 31/05/16 17:56, Bhaktipriya Shridhar wrote:
> System workqueues have been able to handle high level of concurrency
> for a long time now and there's no reason to use dedicated workqueues
> just to gain concurrency.  Replace dedicated xenbus_frontend_wq with the
> use of system_wq.
> 
> Unlike a dedicated per-cpu workqueue created with create_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 guarantees unless the target CPU is
> explicitly specified and the increase of local concurrency shouldn't
> make any difference.
> 
> In this case, there is only a single work item, increase of concurrency
> level by switching to system_wq should not make any difference.

Applied to for-linus-4.8, thanks.

David