From: Tejun Heo <tj@kernel.org>
To: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Cc: Geoff Levand <geoff@infradead.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ps3: Remove deprecated create_singlethread_workqueue
Date: Wed, 31 Aug 2016 10:23:48 -0400 [thread overview]
Message-ID: <20160831142348.GJ12660@htj.duckdns.org> (raw)
In-Reply-To: <20160830171450.GA1890@Karyakshetra>
On Tue, Aug 30, 2016 at 10:44:51PM +0530, Bhaktipriya Shridhar wrote:
> The workqueue "ps3av->wq" queues a single work item &ps3av->work and hence
> doesn't require ordering. It is involved in waking up ps3avd to do the
> video mode setting and hence it's not being used on a memory reclaim
> path. Hence, it has been converted to use 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.
>
> The work item has been flushed in ps3av_remove 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
next prev parent reply other threads:[~2016-08-31 14:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-30 17:14 [PATCH] ps3: Remove deprecated create_singlethread_workqueue Bhaktipriya Shridhar
2016-08-31 14:23 ` Tejun Heo [this message]
2017-12-12 11:39 ` Michael Ellerman
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