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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
