linux-kernel - [PATCH v5 05/10] cpufreq/schedutil: get max utilization

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Date:   Fri, 25 May 2018 15:12:26 +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 05/10] cpufreq/schedutil: get max utilization

Now that we have both the dl class bandwidth requirement and the dl class
utilization, we can use the max of the 2 values when agregating the
utilization of the CPU.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 kernel/sched/sched.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 4526ba6..0eb07a8 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2194,7 +2194,11 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
 #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL
 static inline unsigned long cpu_util_dl(struct rq *rq)
 {
-	return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT;
+	unsigned long util = (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT;
+
+	util = max_t(unsigned long, util, READ_ONCE(rq->avg_dl.util_avg));
+
+	return util;
 }
 
 static inline unsigned long cpu_util_cfs(struct rq *rq)
-- 
2.7.4