On Wed, 2010-11-10 at 16:54 +0100, Frederic Weisbecker wrote:
quoted text
> 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();
}


--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/