linux-kernel - [PATCH v5 06/10] sched: remove rt and dl from sched

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Date:   Fri, 25 May 2018 15:12:27 +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 06/10] sched: remove rt and dl from sched_avg

the utilization level of the CPU by rt and dl tasks is now tracked with
PELT so we can use these metrics and remove them from the rt_avg which
will track only interrupt and stolen virtual time.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 kernel/sched/deadline.c | 2 --
 kernel/sched/fair.c     | 2 ++
 kernel/sched/pelt.c     | 2 +-
 kernel/sched/rt.c       | 2 --
 4 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 950b3fb..da839e7 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1180,8 +1180,6 @@ static void update_curr_dl(struct rq *rq)
 	curr->se.exec_start = now;
 	cgroup_account_cputime(curr, delta_exec);
 
-	sched_rt_avg_update(rq, delta_exec);
-
 	if (dl_entity_is_special(dl_se))
 		return;
 
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 967e873..da75eda 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7562,6 +7562,8 @@ static unsigned long scale_rt_capacity(int cpu)
 
 	used = div_u64(avg, total);
 
+	used += READ_ONCE(rq->avg_rt.util_avg);
+	used += READ_ONCE(rq->avg_dl.util_avg);
 	if (likely(used < SCHED_CAPACITY_SCALE))
 		return SCHED_CAPACITY_SCALE - used;
 
diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c
index b07db80..3d5bd3a 100644
--- a/kernel/sched/pelt.c
+++ b/kernel/sched/pelt.c
@@ -237,7 +237,7 @@ ___update_load_avg(struct sched_avg *sa, unsigned long load, unsigned long runna
 	 */
 	sa->load_avg = div_u64(load * sa->load_sum, divider);
 	sa->runnable_load_avg =	div_u64(runnable * sa->runnable_load_sum, divider);
-	sa->util_avg = sa->util_sum / divider;
+	WRITE_ONCE(sa->util_avg, sa->util_sum / divider);
 }
 
 /*
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index b4148a9..3393c63 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -970,8 +970,6 @@ static void update_curr_rt(struct rq *rq)
 	curr->se.exec_start = now;
 	cgroup_account_cputime(curr, delta_exec);
 
-	sched_rt_avg_update(rq, delta_exec);
-
 	if (!rt_bandwidth_enabled())
 		return;
 
-- 
2.7.4