linux-kernel - Re: SCHED_RR && time

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Date:	Thu, 29 Dec 2011 20:43:35 +0400
From:	Kirill Tkhai <kirill.tkhai@...il.com>
To:	Oleg Nesterov <oleg@...hat.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

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

Kirill

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