linux-kernel - Re: [RFC PATCH v4 05/28] sched/rt: Disable RT_GROUP

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Message-ID: <aWkOFW8ocHRm1VBG@jlelli-thinkpadt14gen4.remote.csb>
Date: Thu, 15 Jan 2026 16:56:05 +0100
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: [RFC PATCH v4 05/28] sched/rt: Disable RT_GROUP_SCHED

Hello,

On 01/12/25 13:41, Yuri Andriaccio wrote:
> Disable the old RT_GROUP_SCHED scheduler. Note that this does not
> completely remove all the RT_GROUP_SCHED functionality, just unhooks it
> and removes most of the relevant functions. Some of the RT_GROUP_SCHED
> functions are kept because they will be adapted for the HCBS scheduling.
> 
> Most notably:
> 
> - Disable the initialization of the rt_bandwidth for group scheduling.
> - Unhook any functionality for RT_GROUP_SCHED in normal rt.c code, leaving
>   only non-group functionality.
> - Remove group related field initialization in init_rt_rq().
> - Remove all the unhooked (and so unused) functions from RT_GROUP_SCHED.
> - Remove all allocation/deallocation code for rt-groups, always returning
>   failure on allocation.
> - Update inc/dec_rt_tasks active tasks' counters, as rt scheduling
>   entities now only represent a single task, and not a group of tasks
>   anymore.
> 
> Signed-off-by: Yuri Andriaccio <yurand2000@...il.com>

Reviewed-by: Juri Lelli <juri.lelli@...hat.com>

Thanks,
Juri