From: Johnlay Park <jonglae.park@samsung.com>
Date: Wed, 28 Feb 2018 03:54:30 +0000 (+0900)
Subject: [COMMON] sched/rt: Use pelt RT b/w in scale_rt_capacity
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b8e8f000ecd7deadb1c4f35577968213027d5701;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[COMMON] sched/rt: Use pelt RT b/w in scale_rt_capacity

Remove rt tasks from rt_avg metric and directly use the average
b/w of rt scheduler in scale_rt_capacity

Change-Id: Ibcb772c15251aae8924ef1580bf81c9f05a26eb8
Signed-off-by: Johnlay Park <jonglae.park@samsung.com>
---

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e2a849be4c34..9a86694f6d88 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8729,23 +8729,16 @@ static inline int get_sd_load_idx(struct sched_domain *sd,
 static unsigned long scale_rt_capacity(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
-	u64 total, used, age_stamp, avg;
-	s64 delta;
+	s64 used;
 
 	/*
-	 * Since we're reading these variables without serialization make sure
-	 * we read them once before doing sanity checks on them.
+	 * Instread of rt_avg in rq, use the sched_rt_avg for more precise caculation
 	 */
-	age_stamp = READ_ONCE(rq->age_stamp);
-	avg = READ_ONCE(rq->rt_avg);
-	delta = __rq_clock_broken(rq) - age_stamp;
-
-	if (unlikely(delta < 0))
-		delta = 0;
-
-	total = sched_avg_period() + delta;
+	used = rq->rt.avg.util_avg;
 
-	used = div_u64(avg, total);
+	/*
+	 * Need to consider bandwidth of deadline tasks
+	 */
 
 	if (likely(used < SCHED_CAPACITY_SCALE))
 		return SCHED_CAPACITY_SCALE - used;