Re: [PATCH] cpuset: Rework sched domains and CPU hotplug handling

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

On Mon, 2008-07-28 at 16:07 +0200, Ingo Molnar wrote:
> * Max Krasnyansky <maxk@qualcomm.com> wrote:
> 
> > Max Krasnyansky wrote:
> > > This is an updated version of my previous cpuset patch:
> > >   "Make rebuild_sched_domains() usable from any context (take 2)"
> > 
> > Folks,
> > 
> > Any comments on this patch ? We need this to complete sched domain 
> > handling fixes/improvements that we started with the cpu_active_map, 
> > and to avoid circular locking issues in the cpu hotplug -> 
> > rebuild_sched_domains path.
> 
> Paul, Peter, any comments?

I'm really not that at home with all that cgroup fiddling, so I'd like a
word from the two Pauls..

Questions I have at the moment:

 -  do we really need a new workqueue for this? Can't we use the regular
keventd stuff, now that Oleg fixed the get_online_cpus() thing?
(3da1c84c00c7e5fa8348336bd8c342f9128b0f14)

 - aren't there funny races with the async_rebuild_sched_domains()
stuff?