From: Dietmar Eggemann <dietmar.eggem...@arm.com>
We do not want to miss out on the ability to do energy-aware idle load
balancing if the system is only partially loaded since the operational
range of energy-aware scheduling corresponds to a partially loaded
system. We might want to pull a single remaining task from a potential
src cpu towards an idle destination cpu if the energy model tells us
this is worth doing to save energy.
cc: Ingo Molnar <mi...@redhat.com>
cc: Peter Zijlstra <pet...@infradead.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggem...@arm.com>
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index b6e2e92..92fd1d8 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7734,7 +7734,7 @@ static int idle_balance(struct rq *this_rq)
this_rq->idle_stamp = rq_clock(this_rq);
if (this_rq->avg_idle < sysctl_sched_migration_cost ||
- !this_rq->rd->overload) {
+ (!energy_aware() && !this_rq->rd->overload)) {
rcu_read_lock();
sd = rcu_dereference_check_sched_domain(this_rq->sd);
if (sd)
--
1.9.1
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