Re: [PATCH 05/32] nohz: Move rcu dynticks idle mode handling to idle enter/exit APIs

Paul E. McKenney
2011-09-04T19:37:12Z

On Fri, Sep 02, 2011 at 10:24:31AM +0200, Peter Zijlstra wrote:
> On Thu, 2011-09-01 at 18:41 -0700, Paul E. McKenney wrote:
> > > Now we could possibly add magic to rcu_read_unlock_special() to restart
> > > the tick in that case.
> >
> > Not from NMI handlers we can't. Unless I am really confused about the
> > code that restarts the tick. Which is not impossible, but ...
>
> Uhm.. good point ;-) yes that will be somewhat detrimental to the
> overall OS health if we attempt such a thing.

But if you don't mind, I would very much like to use your question as
a Quick Quiz. It should be a good one. ;-)

Thanx, Paul