linux-kernel - Re: [PATCH -rebased 07/15] sched_ext: Add a DL server for sched

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Message-ID: <aKYRsCAJqAzVGuZX@gpd4>
Date: Wed, 20 Aug 2025 20:19:28 +0200
From: Andrea Righi <arighi@...dia.com>
To: Joel Fernandes <joelagnelf@...dia.com>
Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>, 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>,
	Valentin Schneider <vschneid@...hat.com>, Tejun Heo <tj@...nel.org>,
	David Vernet <void@...ifault.com>,
	Changwoo Min <changwoo@...lia.com>,
	Luigi De Matteis <ldematteis123@...il.com>,
	sched-ext@...ts.linux.dev
Subject: Re: [PATCH -rebased 07/15] sched_ext: Add a DL server for sched_ext
 tasks

On Wed, Aug 20, 2025 at 11:22:16PM +0530, Joel Fernandes wrote:
> 
> 
> On 8/19/2025 3:57 AM, Peter Zijlstra wrote:
> > On Sat, Aug 09, 2025 at 02:47:52PM -0400, Joel Fernandes wrote:
> > 
> >> --- a/kernel/sched/deadline.c
> >> +++ b/kernel/sched/deadline.c
> >> @@ -1510,7 +1510,7 @@ static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se, s64
> >>  	 * The fair server (sole dl_server) does not account for real-time
> >>  	 * workload because it is running fair work.
> >>  	 */
> >> -	if (dl_se == &rq->fair_server)
> >> +	if (dl_se == &rq->fair_server || dl_se == &rq->ext_server)
> >>  		return;
> > 
> > Does that want to be: if (dl_se->dl_server) ?
> > 
> 
> Yes, that sounds good to me. Andrea, while you're at it could you roll this
> change in too? I'll pick up your branch once I am back from travel next week.

Done already, have a safe trip. :)

-Andrea