linux-kernel - Re: SCHED_RR && time

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Message-ID: <20111229171256.GA5955@redhat.com>
Date:	Thu, 29 Dec 2011 18:12:56 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Kirill Tkhai <kirill.tkhai@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: SCHED_RR && time_slice

On 12/29, Kirill Tkhai wrote:
>
> Thanks for the answers, Oleg.
>
> On Mon, 2011-12-26 at 17:59 +0100, Oleg Nesterov wrote:
> > On 12/23, Kirill Tkhai wrote:
> > >
> > > RT class uses its own fixed
> > > timeslice (in case of RR),
> >
> > which looks confusing too, btw.
> >
> > sched_set_scheduler() does not initialize rt.time_slice, and
> > INIT_TASK() sets time_slice = HZ (not DEF_TIMESLICE).
> >
>
> I talk about task_tick_rt().

me too ;)

> When time_slice is over, it is being
> renewed. New value is DEF_TIMESLICE. This happens in case of SCHED_RR
> class.

Yes, but I was talking about initial value of time_slice, when the
task switches to SCHED_RR.

Oleg.

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