[PATCH v4 07/20] sched/fair: Select preferred CPU at wakeup when possible

[Shrikanth Hegde]

Update available_idle_cpu to consider preferred CPUs. This takes care of
lot of decisions at wakeup to use only preferred CPUs. There is no need to
put those explicit checks everywhere.

Signed-off-by: Shrikanth Hegde <sshegde@xxxxxxxxxxxxx>
---
v3->v4:
- Drop check in sched_balance_find_dst_cpu

 kernel/sched/sched.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 38fd84b0b8f8..f194a5007e3a 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1434,6 +1434,9 @@ static inline bool available_idle_cpu(int cpu)
 	if (!idle_rq(cpu_rq(cpu)))
 		return 0;
 
+	if (!cpu_preferred(cpu))
+		return 0;
+
 	if (vcpu_is_preempted(cpu))
 		return 0;
 
-- 
2.47.3