From: Daeyeong Lee <daeyeong.lee@samsung.com>
Date: Mon, 3 Sep 2018 06:18:48 +0000 (+0900)
Subject: [COMMON] sched: ems: Modify ontime_can_migration condition
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a81551d505d8328481811a09c5b4550b843ae504;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[COMMON] sched: ems: Modify ontime_can_migration condition

Change-Id: I8e4c0fd4843fd5b84f6a8d1340b11f7f1a1b800b
Signed-off-by: Daeyeong Lee <daeyeong.lee@samsung.com>
---

diff --git a/kernel/sched/ems/ontime.c b/kernel/sched/ems/ontime.c
index 37f2cf1f9ba5..1547825de264 100644
--- a/kernel/sched/ems/ontime.c
+++ b/kernel/sched/ems/ontime.c
@@ -643,31 +643,19 @@ int ontime_can_migration(struct task_struct *p, int dst_cpu)
 	}
 
 	/*
-	 * When runqueue is busy, check whether this task is heaviest.
-	 * If this task is not heaviest in runqueue, allow it to be migrated.
+	 * When runqueue is overloaded, check whether cpu's util exceed coverage ratio.
+	 * If so, allow the task to be migrated.
 	 */
 	if (cpu_rq(src_cpu)->nr_running > 1) {
-		struct task_struct *curr = cpu_curr(src_cpu);
-		struct sched_entity *se = __pick_first_entity(p->se.cfs_rq);
-		int count;
+		unsigned long cpu_util = cpu_util_wake(src_cpu, p);
+		unsigned long util = task_util(p);
+		unsigned long coverage_ratio = get_coverage_ratio(src_cpu);
 
-		/* Firstly, compare with curr running task */
-		if (ontime_load_avg(p) < ontime_load_avg(curr)) {
-			trace_ems_ontime_check_migrate(p, dst_cpu, true, "busy runqueue");
+		if ((cpu_util * 100 >= capacity_orig_of(src_cpu) * coverage_ratio)
+				&& (cpu_util > util)) {
+			trace_ems_ontime_check_migrate(p, dst_cpu, true, "exceed coverage");
 			return true;
 		}
-
-		/* Secondly, compare with tasks in rq */
-		for (count = 0; se && count < TASK_TRACK_COUNT;
-				se = __pick_next_entity(se), count++) {
-			if (entity_is_cfs_rq(se))
-				continue;
-
-			if (ontime_load_avg(p) < ontime_load_avg(task_of(se))) {
-				trace_ems_ontime_check_migrate(p, dst_cpu, true, "busy runqueue");
-				return true;
-			}
-		}
 	}
 
 	trace_ems_ontime_check_migrate(p, dst_cpu, false, "heavy task");