linux-kernel - Re: [PATCH 1/4] workqueue: Create low-level unbound workqueues cpumask

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Message-ID: <20140424153716.GG14460@htj.dyndns.org>
Date:	Thu, 24 Apr 2014 11:37:16 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Kevin Hilman <khilman@...aro.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH 1/4] workqueue: Create low-level unbound workqueues
 cpumask

On Thu, Apr 24, 2014 at 04:37:33PM +0200, Frederic Weisbecker wrote:
> Create a cpumask that limit the affinity of all unbound workqueues.
> This cpumask is controlled though a file at the root of the workqueue
> sysfs directory.
> 
> It works on a lower-level than the per WQ_SYSFS workqueues cpumask files
> such that the effective cpumask applied for a given unbound workqueue is
> the intersection of /sys/devices/virtual/workqueue/$WORKQUEUE/cpumask and
> the new /sys/devices/virtual/workqueue/cpumask_unbounds file.

Let's drop "_unbounds" postfix and name it just "cpumask".  We don't
apply it to per-cpu workqueues now but that really is an
implementation detail and later when (and if) we actually distinguish
per-cpu usages for correctness from for optimization, we may as well
apply the same cpumask to per-cpu ones too.

Another thing with naming is that I didn't anticipate having
attributes at the top directory so the workqueue directories aren't
namespaced.  Maybe we want to namespace top level knobs?
"system_cpumask" maybe?  Any better ideas?

Thanks.

-- 
tejun
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