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SubjectRe: [PATCH] a local-timer-free version of RCU
On Wed, Nov 10, 2010 at 08:19:20PM -0800, Paul E. McKenney wrote:
> On Wed, Nov 10, 2010 at 06:31:11PM +0100, Peter Zijlstra wrote:
> > On Wed, 2010-11-10 at 16:54 +0100, Frederic Weisbecker wrote:
> > > run the sched tick and if there was nothing to do
> > > for some time and we are in userspace, deactivate it.
> >
> > Not for some time, immediately, have the tick track if it was useful, if
> > it was not, have it stop itself, like:
> >
> > tick()
> > {
> > int stop = 1;
> >
> > if (nr_running > 1)
> > stop = 0;
> >
> > if(rcu_needs_cpu())
> > stop = 0;
> >
> > ...
> >
> >
> > if (stop)
> > enter_nohz_mode();
> > }
>
> I am still holding out for a dyntick-hpc version of RCU that does not
> need the tick. ;-)


So you don't think it would be an appropriate solution? Keeping the tick for short
periods of time while we need it only, that looks quite a good way to try.

Hmm?



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