Paul Menage wrote:
> Second idea - can we just punt the call to rebuild_sched_domains() to
> a workqueue thread if it's due to a flag or cpumask change? Does it
> matter if the call doesn't happen synchronously? The work handler
> could easily nest the cgroup_lock() call inside get_online_cpus() and
> then call rebuild_sched_domains()

I was thinking about exactly the same thing. I kind of don't like async 
nature of it. Maybe it's ok but there might be some interesting races 
with async domain updates.

Max
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