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

[Frederic Weisbecker]

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@xxxxxxxxxxxxxx>
> 
> 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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