[PATCH 1/5] sched: remove one division operation in find_buiest_queue()

[Joonsoo Kim]

Remove one division operation in find_buiest_queue().

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6f238d2..1d8774f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4911,7 +4911,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
 				     struct sched_group *group)
 {
 	struct rq *busiest = NULL, *rq;
-	unsigned long max_load = 0;
+	unsigned long busiest_load = 0, busiest_power = SCHED_POWER_SCALE;
 	int i;
 
 	for_each_cpu(i, sched_group_cpus(group)) {
@@ -4942,10 +4942,9 @@ static struct rq *find_busiest_queue(struct lb_env *env,
 		 * the load can be moved away from the cpu that is potentially
 		 * running at a lower capacity.
 		 */
-		wl = (wl * SCHED_POWER_SCALE) / power;
-
-		if (wl > max_load) {
-			max_load = wl;
+		if (wl * busiest_power > busiest_load * power) {
+			busiest_load = wl;
+			busiest_power = power;
 			busiest = rq;
 		}
 	}
-- 
1.7.9.5

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