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Message-ID: <1325177015.9304.9.camel@hp>
Subject: Re: SCHED_RR && time_slice
From: Kirill Tkhai <kirill.tkhai@gmail.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 29 Dec 2011 20:43:35 +0400
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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