linux-kernel - Re: [PATCH v3 1/8] sched/deadline: Ignore special tasks when rebuilding domains

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Message-ID: <xhsmhr032pe7g.mognet@vschneid-thinkpadt14sgen2i.remote.csb>
Date: Wed, 12 Mar 2025 14:32:03 +0100
From: Valentin Schneider <vschneid@...hat.com>
To: Juri Lelli <juri.lelli@...hat.com>, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot
 <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel
 Gorman <mgorman@...e.de>, Waiman Long <longman@...hat.com>, Tejun Heo
 <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>, Michal Koutný
 <mkoutny@...e.com>, Qais Yousef <qyousef@...alina.io>, Sebastian Andrzej
 Siewior <bigeasy@...utronix.de>, Swapnil Sapkal <swapnil.sapkal@....com>,
 Shrikanth Hegde <sshegde@...ux.ibm.com>, Phil Auld <pauld@...hat.com>,
 luca.abeni@...tannapisa.it, tommaso.cucinotta@...tannapisa.it, Jon Hunter
 <jonathanh@...dia.com>
Subject: Re: [PATCH v3 1/8] sched/deadline: Ignore special tasks when
 rebuilding domains

On 10/03/25 10:19, Juri Lelli wrote:
> SCHED_DEADLINE special tasks get a fake bandwidth that is only used to
> make sure sleeping and priority inheritance 'work', but it is ignored
> for runtime enforcement and admission control.
>
> Be consistent with it also when rebuilding root domains.
>
> Reported-by: Jon Hunter <jonathanh@...dia.com>
> Fixes: 53916d5fd3c0 ("sched/deadline: Check bandwidth overflow earlier for hotplug")
> Tested-by: Waiman Long <longman@...hat.com>
> Tested-by: Jon Hunter <jonathanh@...dia.com>
> Signed-off-by: Juri Lelli <juri.lelli@...hat.com>

Reviewed-by: Valentin Schneider <vschneid@...hat.com>