On Sat, Jul 16, 2016 at 02:25:56PM +0530, Bhaktipriya Shridhar wrote: > The workqueue "work_thread" is involved in streaming the camera data. > It has a single work item(&dev->work_struct) 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. > > Work item has been flushed in sd_stop0() to ensure that there are no > pending tasks while disconnecting the driver. > > Signed-off-by: Bhaktipriya Shridhar <bhaktipriy...@gmail.com>
Acked-by: Tejun Heo <t...@kernel.org> Thanks. -- tejun
