linux-kernel - Re: [PATCH v3 3/8] sched/deadline: Generalize unique visiting of root domains

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Message-ID: <xhsmho6y6pe6y.mognet@vschneid-thinkpadt14sgen2i.remote.csb>
Date: Wed, 12 Mar 2025 14:32:21 +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>,
 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 3/8] sched/deadline: Generalize unique visiting of
 root domains

On 10/03/25 10:35, Juri Lelli wrote:
> Bandwidth checks and updates that work on root domains currently employ
> a cookie mechanism for efficiency. This mechanism is very much tied to
> when root domains are first created and initialized.
>
> Generalize the cookie mechanism so that it can be used also later at
> runtime while updating root domains. Also, additionally guard it with
> sched_domains_mutex, since domains need to be stable while updating them
> (and it will be required for further dynamic changes).
>
> 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>