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

[Frederic Weisbecker]

On Mon, Feb 17, 2014 at 06:26:41AM +0100, Mike Galbraith wrote:
> On Wed, 2014-02-12 at 19:23 +0100, Frederic Weisbecker wrote: 
> > 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.
> 
> Handing control to the user seemed like a fine thing, so I started
> making a boot option to enable it.  Forcing WQ_SYSFS on at sysfs
> decision spot doesn't go well, init order matters :)  Post init frobbing
> required if you want to see/frob all unbound.

I'm curious about the details. Is that because some workqueues are registered
before sysfs is even initialized?
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