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

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Message-ID: <b832305f-5642-4d9b-8694-a60ab7c4adc5@nvidia.com>
Date: Wed, 20 Aug 2025 23:22:16 +0530
From: Joel Fernandes <joelagnelf@...dia.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: 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>,
 Andrea Righi <arighi@...dia.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 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.

thanks,

 - Joel