linux-kernel - Re: [RFC PATCH] rcu: move SRCU grace period work to power efficient workqueue

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Message-ID: <20140212192354.GC26809@htj.dyndns.org>
Date:	Wed, 12 Feb 2014 14:23:54 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zoran Markovic <zoran.markovic@...aro.org>,
	linux-kernel@...r.kernel.org,
	Shaibal Dutta <shaibal.dutta@...adcom.com>,
	Dipankar Sarma <dipankar@...ibm.com>
Subject: Re: [RFC PATCH] rcu: move SRCU grace period work to power efficient
 workqueue

Hello,

On Wed, Feb 12, 2014 at 11:02:41AM -0800, Paul E. McKenney wrote:
> +2.	Use the /sys/devices/virtual/workqueue/*/cpumask sysfs files
> +	to force the WQ_SYSFS workqueues to run on the specified set
> +	of CPUs.  The set of WQ_SYSFS workqueues can be displayed using
> +	"ls sys/devices/virtual/workqueue".

One thing to be careful about is that once published, it becomes part
of userland visible interface.  Maybe adding some words warning
against sprinkling WQ_SYSFS willy-nilly is a good idea?

Thanks.

-- 
tejun
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