Re: [PATCH v2] xen: xenbus: Remove create_workqueue

From: Tejun Heo
Date: Tue May 31 2016 - 13:29:58 EST

On Tue, May 31, 2016 at 10:26:30PM +0530, 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.
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@xxxxxxxxx>

Acked-by: Tejun Heo <tj@xxxxxxxxxx>