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Commit f2d455ad authored by Joonwoo Park's avatar Joonwoo Park
Browse files

sched: WALT: don't bias towards prev CPU when ediff == 0 



The target_cpu can be often better choice than previous CPU considering
CPU load.  Always place task on target_cpu rather than previous CPU
when energy cost difference is same.

Change-Id: Id47b5a0c5dbbbbb0d7c43e7dd5f2d958683bc1a7
Signed-off-by: default avatarJoonwoo Park <joonwoop@codeaurora.org>
parent 16f1ddde

kernel/sched/fair.c

+5 −6
Original line number Diff line number Diff line
@@ -6778,13 +6778,12 @@ static int energy_aware_wake_cpu(struct task_struct *p, int target, int sync) 
				return task_cpu(p);

			}

		} else {

			cpu_idle_idx = cpu_rq(task_cpu(p))->nr_running ? -1 :

				       idle_get_state_idx(cpu_rq(task_cpu(p)));

			if (ediff > 0 || (ediff == 0 &&

					  cpu_idle_idx <= min_idle_idx)) {

			if (ediff > 0) {

				trace_sched_task_util_energy_diff(p,

						task_cpu(p), task_util(p),

						target_cpu, task_cpu(p), ediff);

							task_cpu(p),

							task_util(p),

							target_cpu,

							task_cpu(p), ediff);

				return task_cpu(p);

			}

		}