linux-kernel - Re: [RFC PATCH v3 06/24] sched/rt: Introduce HCBS specific structs in task

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Message-ID: <aN6hFCYJy-XjROFP@jlelli-thinkpadt14gen4.remote.csb>
Date: Thu, 2 Oct 2025 16:58:12 +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 v3 06/24] sched/rt: Introduce HCBS specific structs
 in task_group

Hello,

On 29/09/25 11:22, Yuri Andriaccio wrote:
> From: luca abeni <luca.abeni@...tannapisa.it>
> 
> Each task_group manages a number of new objects:
> - a sched_dl_entity/dl_server for each CPU
> - a dl_bandwidth object to keep track of its allocated dl_bandwidth
> 
> Co-developed-by: Alessio Balsini <a.balsini@...up.it>
> Signed-off-by: Alessio Balsini <a.balsini@...up.it>
> Co-developed-by: Andrea Parri <parri.andrea@...il.com>
> Signed-off-by: Andrea Parri <parri.andrea@...il.com>
> Co-developed-by: Yuri Andriaccio <yurand2000@...il.com>
> Signed-off-by: Yuri Andriaccio <yurand2000@...il.com>
> Signed-off-by: luca abeni <luca.abeni@...tannapisa.it>
> ---

...

> @@ -467,10 +474,17 @@ struct task_group {
>  #endif /* CONFIG_FAIR_GROUP_SCHED */
>  
>  #ifdef CONFIG_RT_GROUP_SCHED
> +	/*
> +	 * Each task group manages a different scheduling entity per CPU, i.e. a
> +	 * different deadline server, and a runqueue per CPU. All the dl-servers
> +	 * share the same dl_bandwidth object.
> +	 */
>  	struct sched_rt_entity	**rt_se;
> +	struct sched_dl_entity	**dl_se;
>  	struct rt_rq		**rt_rq;
>  
>  	struct rt_bandwidth	rt_bandwidth;
> +	struct dl_bandwidth	dl_bandwidth;
>  #endif
>  
>  	struct scx_task_group	scx;
> @@ -817,12 +831,12 @@ struct rt_rq {
>  	raw_spinlock_t		rt_runtime_lock;
>  
>  	unsigned int		rt_nr_boosted;
> -
> -	struct rq		*rq; /* this is always top-level rq, cache? */
>  #endif
>  #ifdef CONFIG_CGROUP_SCHED
>  	struct task_group	*tg; /* this tg has "this" rt_rq on given CPU for runnable entities */
>  #endif
> +
> +	struct rq		*rq; /* cgroup's runqueue if the rt_rq entity belongs to a cgroup, otherwise top-level rq */

The comment really wants to span multiple lines, maybe above the
pointer.

Thanks,
Juri