[RFC][PATCH 5/9] sched: Make idle_balance() skip cpus with a cpu_power of 1

[Morten Rasmussen]

idle_balance() should disregard cpus disabled by the power scheduler.

This is a quick fix. idle_balance() should be revisit to implement proper
handling of cpus with cpu_power=1.

Signed-off-by: Morten Rasmussen <morten.rasmussen@xxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxxxxx>
CC: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CC: Catalin Marinas <catalin.marinas@xxxxxxx>
---
 kernel/sched/fair.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4610463..a59617b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5261,6 +5261,10 @@ void idle_balance(int this_cpu, struct rq *this_rq)
 	if (this_rq->avg_idle < sysctl_sched_migration_cost)
 		return;
 
+	/* Don't pull tasks if disable by power scheduler */
+	if (!power_cpu_balance(this_cpu))
+		return;
+
 	/*
 	 * Drop the rq->lock, but keep IRQ/preempt disabled.
 	 */
-- 
1.7.9.5


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