linux-kernel - Re: [PATCH 08/15] sched,fair: simplify timeslice length code

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Message-ID: <2d3af2a8b6a433ea44a4605fc8b43bd0758102eb.camel@surriel.com>
Date:   Fri, 30 Aug 2019 11:01:46 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Kernel Team <kernel-team@...com>, Paul Turner <pjt@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH 08/15] sched,fair: simplify timeslice length code

On Fri, 2019-08-30 at 08:41 +0200, Vincent Guittot wrote:

> > When tasks get their timeslice rounded up, that will increase
> > the total sched period in a similar way the old code did by
> > returning a longer period from __sched_period.
> 
> sched_slice is not a strict value and scheduler will not schedule out
> the task after the sched_slice (unless you enable HRTICK which is
> disable by default). Instead it will wait for next tick to change the
> running task
> 
> sched_slice is mainly use to ensure a minimum running time in a row.
> With this change, the running time of the high priority task will
> most
> probably be split in several slice instead of one

I would be more than happy to drop this patch if you
prefer. Just let me know.

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