On Fri, 2010-12-24 at 16:00 +0800, Lai Jiangshan wrote: 
> On 12/20/2010 11:24 PM, Frederic Weisbecker wrote:
> >  
> > +config NO_HZ_TASK
> > +       bool "Tickless task"
> > +       depends on HAVE_NO_HZ_TASK && NO_HZ && SMP && HIGH_RES_TIMERS
> > +       help
> > +         When a task runs alone on a CPU and switches into this mode,
> > +         the timer interrupt will only trigger when it is strictly
> > +         needed.
> 
> Why it depends on SMP?
> 
I guess that's because you need at least a ticking CPU for timekeeping
and stuff... Right?

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://retis.sssup.it/people/faggioli -- dario.faggioli@jabber.org