linux-kernel - [PATCH v5 03/10] cpufreq/schedutil: add rt utilization tracking

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Message-Id: <1527253951-22709-4-git-send-email-vincent.guittot@linaro.org>
Date:   Fri, 25 May 2018 15:12:24 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, rjw@...ysocki.net
Cc:     juri.lelli@...hat.com, dietmar.eggemann@....com,
        Morten.Rasmussen@....com, viresh.kumar@...aro.org,
        valentin.schneider@....com, quentin.perret@....com,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH v5 03/10] cpufreq/schedutil: add rt utilization tracking

Add both cfs and rt utilization when selecting an OPP for cfs tasks as rt
can preempt and steal cfs's running time.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 kernel/sched/cpufreq_schedutil.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index 28592b6..a84b5a5 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -56,6 +56,7 @@ struct sugov_cpu {
 	/* The fields below are only needed when sharing a policy: */
 	unsigned long		util_cfs;
 	unsigned long		util_dl;
+	unsigned long		util_rt;
 	unsigned long		max;
 
 	/* The field below is for single-CPU policies only: */
@@ -178,14 +179,21 @@ static void sugov_get_util(struct sugov_cpu *sg_cpu)
 	sg_cpu->max = arch_scale_cpu_capacity(NULL, sg_cpu->cpu);
 	sg_cpu->util_cfs = cpu_util_cfs(rq);
 	sg_cpu->util_dl  = cpu_util_dl(rq);
+	sg_cpu->util_rt  = cpu_util_rt(rq);
 }
 
 static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
 {
 	struct rq *rq = cpu_rq(sg_cpu->cpu);
+	unsigned long util;
 
-	if (rq->rt.rt_nr_running)
-		return sg_cpu->max;
+	if (rq->rt.rt_nr_running) {
+		util = sg_cpu->max;
+	} else {
+		util = sg_cpu->util_dl;
+		util += sg_cpu->util_cfs;
+		util += sg_cpu->util_rt;
+	}
 
 	/*
 	 * Utilization required by DEADLINE must always be granted while, for
@@ -197,7 +205,7 @@ static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
 	 * util_cfs + util_dl as requested freq. However, cpufreq is not yet
 	 * ready for such an interface. So, we only do the latter for now.
 	 */
-	return min(sg_cpu->max, (sg_cpu->util_dl + sg_cpu->util_cfs));
+	return min(sg_cpu->max, util);
 }
 
 static void sugov_set_iowait_boost(struct sugov_cpu *sg_cpu, u64 time, unsigned int flags)
-- 
2.7.4