On Fri, May 23, 2014 at 05:53:05PM +0200, Vincent Guittot wrote:
> @@ -6052,8 +6006,8 @@ static inline void update_sd_lb_stats(struct lb_env
> *env, struct sd_lb_stats *sd
> * with a large weight task outweighs the tasks on the system).
> */
> if (prefer_sibling && sds->local &&
> - sds->local_stat.group_has_capacity)
> - sgs->group_capacity = min(sgs->group_capacity, 1U);
> + sds->local_stat.group_capacity > 0)
> + sgs->group_capacity = min(sgs->group_capacity, 1L);
>
> if (update_sd_pick_busiest(env, sds, sg, sgs)) {
> sds->busiest = sg;
> @@ -6228,7 +6182,7 @@ static inline void calculate_imbalance(struct lb_env
> *env, struct sd_lb_stats *s
> * have to drop below capacity to reach cpu-load equilibrium.
> */
> load_above_capacity =
> - (busiest->sum_nr_running - busiest->group_capacity);
> + (busiest->sum_nr_running - busiest->group_weight);
>
> load_above_capacity *= (SCHED_LOAD_SCALE * SCHED_POWER_SCALE);
> load_above_capacity /= busiest->group_power;
I think you just broke PREFER_SIBLING here..
So we want PREFER_SIBLING to work on nr_running, not utilization because
we want to spread single tasks around, regardless of their utilization.
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