The capacity of a CPU/group should be some intrinsic value that doesn't change with task placement. It is like a container which capacity is stable regardless of the amount of liquid in it... unless the container itself is crushed that is, but that's another story.
Therefore let's rename "has_capacity" to "has_free_capacity" in order to better convey the wanted meaning. Signed-off-by: Nicolas Pitre <[email protected]> --- kernel/sched/fair.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e375dcc3f2..0eda4c527e 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1030,7 +1030,7 @@ struct numa_stats { /* Approximate capacity in terms of runnable tasks on a node */ unsigned long task_capacity; - int has_capacity; + int has_free_capacity; }; /* @@ -1056,8 +1056,8 @@ static void update_numa_stats(struct numa_stats *ns, int nid) * the @ns structure is NULL'ed and task_numa_compare() will * not find this node attractive. * - * We'll either bail at !has_capacity, or we'll detect a huge imbalance - * and bail there. + * We'll either bail at !has_free_capacity, or we'll detect a huge + * imbalance and bail there. */ if (!cpus) return; @@ -1065,7 +1065,7 @@ static void update_numa_stats(struct numa_stats *ns, int nid) ns->load = (ns->load * SCHED_POWER_SCALE) / ns->compute_capacity; ns->task_capacity = DIV_ROUND_CLOSEST(ns->compute_capacity, SCHED_POWER_SCALE); - ns->has_capacity = (ns->nr_running < ns->task_capacity); + ns->has_free_capacity = (ns->nr_running < ns->task_capacity); } struct task_numa_env { @@ -1167,8 +1167,8 @@ static void task_numa_compare(struct task_numa_env *env, if (!cur) { /* Is there capacity at our destination? */ - if (env->src_stats.has_capacity && - !env->dst_stats.has_capacity) + if (env->src_stats.has_free_capacity && + !env->dst_stats.has_free_capacity) goto unlock; goto balance; @@ -1276,8 +1276,8 @@ static int task_numa_migrate(struct task_struct *p) groupimp = group_weight(p, env.dst_nid) - groupweight; update_numa_stats(&env.dst_stats, env.dst_nid); - /* If the preferred nid has capacity, try to use it. */ - if (env.dst_stats.has_capacity) + /* If the preferred nid has free capacity, try to use it. */ + if (env.dst_stats.has_free_capacity) task_numa_find_cpu(&env, taskimp, groupimp); /* No space available on the preferred nid. Look elsewhere. */ @@ -5491,7 +5491,7 @@ struct sg_lb_stats { unsigned int idle_cpus; unsigned int group_weight; int group_imb; /* Is there an imbalance in the group ? */ - int group_has_capacity; /* Is there extra capacity in the group? */ + int group_has_free_capacity; #ifdef CONFIG_NUMA_BALANCING unsigned int nr_numa_running; unsigned int nr_preferred_running; @@ -5858,7 +5858,7 @@ static inline void update_sg_lb_stats(struct lb_env *env, sgs->group_capacity = sg_capacity(env, group); if (sgs->group_capacity > sgs->sum_nr_running) - sgs->group_has_capacity = 1; + sgs->group_has_free_capacity = 1; } /** @@ -5982,7 +5982,7 @@ 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) + sds->local_stat.group_has_free_capacity) sgs->group_capacity = min(sgs->group_capacity, 1U); if (update_sd_pick_busiest(env, sds, sg, sgs)) { @@ -6242,8 +6242,8 @@ static struct sched_group *find_busiest_group(struct lb_env *env) goto force_balance; /* SD_BALANCE_NEWIDLE trumps SMP nice when underutilized */ - if (env->idle == CPU_NEWLY_IDLE && local->group_has_capacity && - !busiest->group_has_capacity) + if (env->idle == CPU_NEWLY_IDLE && local->group_has_free_capacity && + !busiest->group_has_free_capacity) goto force_balance; /* -- 1.8.4.108.g55ea5f6 -- 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/
