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.rasmus...@arm.com>
CC: Ingo Molnar <mi...@kernel.org>
CC: Peter Zijlstra <pet...@infradead.org>
CC: Catalin Marinas <catalin.mari...@arm.com>
---
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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