linux-kernel - Re: [RFC PATCH 2/3] sched/deadline: add task groups bandwidth management support

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Message-ID: <20180212164726.GT695913@devbig577.frc2.facebook.com>
Date:   Mon, 12 Feb 2018 08:47:26 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        vincent.guittot@...aro.org, rostedt@...dmis.org,
        luca.abeni@...tannapisa.it, claudio@...dence.eu.com,
        tommaso.cucinotta@...tannapisa.it, bristot@...hat.com,
        mathieu.poirier@...aro.org, tkjos@...roid.com, joelaf@...gle.com,
        morten.rasmussen@....com, dietmar.eggemann@....com,
        patrick.bellasi@....com, alessio.balsini@....com
Subject: Re: [RFC PATCH 2/3] sched/deadline: add task groups bandwidth
 management support

Hello,

On Mon, Feb 12, 2018 at 02:40:29PM +0100, Juri Lelli wrote:
>  - implementation _is not_ hierarchical: only single/plain DEADLINE entities
>    can be handled, and they get scheduled at root rq level

This usually is a deal breaker and often indicates that the cgroup
filesystem is not the right interface for the feature.  Can you please
elaborate the interface with some details?

Thanks.

-- 
tejun