sched/fair: Consider others if target cpu overutilized

If target cpu overutilized, it's better to consider
other group cpu. It can avoid unnecessary waiting on
overutilized cpu and wait until load balance for task
to be run.

Change-Id: I6f8bccb611d2f11471254cf2795fb5bf3f122292
Signed-off-by: Maria Yu <aiquny@codeaurora.org>
(cherry picked from commit b9f8fdc34eeb61fcc7c770b6277a83fd30fc7d8e)

Author: sixtaku

kernel/sched/fair.c

@@ -6246,6 +6246,12 @@ static inline bool task_fits_max(struct task_struct *p, int cpu)
 	return __task_fits(p, cpu, 0);
 }
 
+static inline bool cpu_check_overutil_condition(int cpu,
+						unsigned long util)
+{
+	return (capacity_orig_of(cpu) * 1024) < (util * capacity_margin);
+}
+
 bool __cpu_overutilized(int cpu, int delta)
 {
 	return (capacity_orig_of(cpu) * 1024) <
@@ -7093,7 +7099,7 @@ static inline int find_best_target(struct task_struct *p, int *backup_cpu,
 			 */
 			min_capped_util = max(new_util, capacity_min_of(i));
 
-			if (new_util > capacity_orig)
+			if (cpu_check_overutil_condition(i, new_util))
 				continue;
 
 			/*