linux-kernel - Re: [PATCH v3] sched/deadline: Remove fair-servers from real-time task's bandwidth accounting

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Message-ID: <aLa3zdmyKuRMy3bm@jlelli-thinkpadt14gen4.remote.csb>
Date: Tue, 2 Sep 2025 11:24:29 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: Yuri Andriaccio <yurand2000@...il.com>
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>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org,
	Luca Abeni <luca.abeni@...tannapisa.it>,
	Yuri Andriaccio <yuri.andriaccio@...tannapisa.it>
Subject: Re: [PATCH v3] sched/deadline: Remove fair-servers from real-time
 task's bandwidth accounting

Hi,

On 01/09/25 13:31, Yuri Andriaccio wrote:

...

> This also means that in order to increase the maximum bandwidth for real-time
> tasks, the bw of fair-servers must be first decreased through debugfs otherwise
> admission tests will fail, and viceversa, to increase the bw of fair-servers,
> the bw of real-time tasks must be reduced beforehand.

Hummm, but now I get an error when trying to do the latter?

# echo 855000 >/proc/sys/kernel/sched_rt_runtime_us
bash: echo: write error: Device or resource busy

Thanks,
Juri