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Subject[PATCH v2 10/11] sched: move cfs task on a CPU with higher capacity
Date
If the CPU is used for handling lot of IRQs, trig a load balance to check if
it's worth moving its tasks on another CPU that has more capacity

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
kernel/sched/fair.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e8a30f9..2501e49 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5948,6 +5948,13 @@ static bool update_sd_pick_busiest(struct lb_env *env,
if (sgs->sum_nr_running > sgs->group_capacity)
return true;

+ /*
+ * The group capacity is reduced probably because of activity from other
+ * sched class or interrupts which use part of the available capacity
+ */
+ if ((sg->sgp->power_orig * 100) > (sgs->group_power * env->sd->imbalance_pct))
+ return true;
+
if (sgs->group_imb)
return true;

@@ -7282,6 +7289,12 @@ static inline int nohz_kick_needed(struct rq *rq)

if (nr_busy > 1)
goto need_kick_unlock;
+
+ if ((rq->cfs.h_nr_running >= 1)
+ && ((rq->cpu_power * sd->imbalance_pct) <
+ (rq->cpu_power_orig * 100)))
+ goto need_kick_unlock;
+
}

sd = rcu_dereference(per_cpu(sd_asym, cpu));
--
1.9.1


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