linux-kernel - Re: [PATCH v3 0/6] cpufreq: schedutil: fixes for flags updates

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Date:   Fri, 22 Dec 2017 13:10:15 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Patrick Bellasi <patrick.bellasi@....com>
Cc:     Juri Lelli <juri.lelli@...hat.com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Todd Kjos <tkjos@...roid.com>,
        Joel Fernandes <joelaf@...gle.com>
Subject: Re: [PATCH v3 0/6] cpufreq: schedutil: fixes for flags updates

On Fri, Dec 22, 2017 at 12:46:18PM +0100, Peter Zijlstra wrote:
> Blergh that'd make a mess of things again.

Something like so then..

--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -187,11 +187,16 @@ static void sugov_get_util(struct sugov_
 
 static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
 {
-	unsigned long util = sg_cpu->util_cfs + sg_cpu->util_dl;
 	struct rq *rq = cpu_rq(sg_cpu->cpu);
+	unsigned long util;
 
-	if (rq->rt.rt_nr_running)
+	if (rq->rt.rt_nr_running) {
 		util = sg_cpu->max;
+	} else {
+		util = sg_cpu->util_dl;
+		if (rq->cfs.h_nr_running)
+			util += sg_cpu->util_cfs;
+	}
 
 	/*
 	 * Ideally we would like to set util_dl as min/guaranteed freq and