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

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Date:	Wed, 12 Feb 2014 19:23:38 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Kevin Hilman <khilman@...aro.org>, Tejun Heo <tj@...nel.org>
Cc:	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>, tj@...nel.org
Subject: Re: [RFC PATCH] rcu: move SRCU grace period work to power efficient
 workqueue

On Mon, Feb 10, 2014 at 10:47:29AM -0800, Paul E. McKenney wrote:
> On Mon, Feb 10, 2014 at 06:08:31PM +0800, Lai Jiangshan wrote:
> > Acked-by: Lai Jiangshan <laijs@...fujitsu.com>
> 
> Thank you all, queued for 3.15.
> 
> We should also have some facility for moving the SRCU workqueues to
> housekeeping/timekeeping kthreads in the NO_HZ_FULL case.  Or does
> this patch already have that effect?

Kevin Hilman and me plan to try to bring a new Kconfig option that could let
us control the unbound workqueues affinity through sysfs.

The feature actually exist currently but is only enabled for workqueues that
have WQ_SYSFS. Writeback and raid5 are the only current users.

See for example: /sys/devices/virtual/workqueue/writeback/cpumask
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