linux-kernel - Re: [PATCH 3/3] workqueue: Add anon workqueue sysfs hierarchy

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Message-ID: <20140322185551.GA24945@htj.dyndns.org>
Date:	Sat, 22 Mar 2014 14:55:51 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Kevin Hilman <khilman@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH 3/3] workqueue: Add anon workqueue sysfs hierarchy

On Sat, Mar 22, 2014 at 06:01:18PM +0100, Frederic Weisbecker wrote:
> 1) Call a per workqueue mutex when a work execute on an ordered workqueue. Although
>   contention should be very rare (only while we replace the workqueue attrs and
>   switch to a new worker), frequent locking may have a visible impact.
> 
> 2) Have a seperate worker for all ordered workqueues. But we may lose a bit of
>   serialization with other workqueues along the way.

Ordered workqueues are always bound to the fallback default worker
pool.  Why not just adjust cpus_allowed of the worker pool?

Thanks.

-- 
tejun
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