linux-kernel - [PATCH] sched: move access of avg_rt and avg

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Message-Id: <20231220065522.351915-1-sshegde@linux.vnet.ibm.com>
Date: Wed, 20 Dec 2023 12:25:22 +0530
From: Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>
To: mingo@...nel.org, peterz@...radead.org, vincent.guittot@...aro.org
Cc: sshegde@...ux.vnet.ibm.com, dietmar.eggemann@....com,
        linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com,
        yu.c.chen@...el.com, tim.c.chen@...ux.intel.com
Subject: [PATCH] sched: move access of avg_rt and avg_dl into existing helper functions

This is a minor code simplification. There are helper functions called
cpu_util_dl and cpu_util_rt which gives the average utilization of DL
and RT respectively. But there are few places in code where these
variables are used directly.

Instead use the helper function so that code becomes simpler and easy to
maintain later on.

Signed-off-by: Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>
---
 kernel/sched/fair.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index bcea3d55d95d..02631060ca7e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9212,19 +9212,17 @@ static inline bool cfs_rq_has_blocked(struct cfs_rq *cfs_rq)

 static inline bool others_have_blocked(struct rq *rq)
 {
-	if (READ_ONCE(rq->avg_rt.util_avg))
+	if (cpu_util_rt(rq))
 		return true;

-	if (READ_ONCE(rq->avg_dl.util_avg))
+	if (cpu_util_dl(rq))
 		return true;

 	if (thermal_load_avg(rq))
 		return true;

-#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
-	if (READ_ONCE(rq->avg_irq.util_avg))
+	if (cpu_util_irq(rq))
 		return true;
-#endif

 	return false;
 }
@@ -9481,8 +9479,8 @@ static unsigned long scale_rt_capacity(int cpu)
 	 * avg_thermal.load_avg tracks thermal pressure and the weighted
 	 * average uses the actual delta max capacity(load).
 	 */
-	used = READ_ONCE(rq->avg_rt.util_avg);
-	used += READ_ONCE(rq->avg_dl.util_avg);
+	used = cpu_util_rt(rq);
+	used += cpu_util_dl(rq);
 	used += thermal_load_avg(rq);

 	if (unlikely(used >= max))
--
2.39.3