From: Tejun Heo <tj@kernel.org>
To: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Cc: Mark Brown <broonie@kernel.org>,
linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] spi: spi-bfin5xx: Remove deprecated create_singlethread_workqueue
Date: Sat, 2 Jul 2016 06:37:47 -0500 [thread overview]
Message-ID: <20160702113747.GG17431@htj.duckdns.org> (raw)
In-Reply-To: <20160702084200.GA27584@Karyakshetra>
On Sat, Jul 02, 2016 at 02:12:00PM +0530, Bhaktipriya Shridhar wrote:
> The workqueue "workqueue" serves as a driver message queue.
> It has a single work item(&drv_data->pump_messages) 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 bfin_spi_destroy_queue() to ensure that there
> are no pending tasks while disconnecting the driver.
>
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
--
tejun
prev parent reply other threads:[~2016-07-02 11:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-02 8:42 [PATCH] spi: spi-bfin5xx: Remove deprecated create_singlethread_workqueue Bhaktipriya Shridhar
2016-07-02 11:37 ` Tejun Heo [this message]
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