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Subject: Re: [RFC PATCH 01/15] nohz_task: New mask for cpus having nohz task
From: Dario Faggioli <raistlin@linux.it>
To: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>,
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Date: Fri, 24 Dec 2010 09:19:56 +0100
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On Fri, 2010-12-24 at 16:00 +0800, Lai Jiangshan wrote:=20
> On 12/20/2010 11:24 PM, Frederic Weisbecker wrote:
> > =20
> > +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.
>=20
> Why it depends on SMP?
>=20
I guess that's because you need at least a ticking CPU for timekeeping
and stuff... Right?

Regards,
Dario

--=20
<<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

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