diff options
| -rw-r--r-- | kernel/sched/fair.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c11e36ff5ea0..201be782b5b3 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1000,7 +1000,7 @@ struct numa_stats { */ static void update_numa_stats(struct numa_stats *ns, int nid) { - int cpu; + int cpu, cpus = 0; memset(ns, 0, sizeof(*ns)); for_each_cpu(cpu, cpumask_of_node(nid)) { @@ -1009,8 +1009,21 @@ static void update_numa_stats(struct numa_stats *ns, int nid) ns->nr_running += rq->nr_running; ns->load += weighted_cpuload(cpu); ns->power += power_of(cpu); + + cpus++; } + /* + * If we raced with hotplug and there are no CPUs left in our mask + * 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. + */ + if (!cpus) + return; + ns->load = (ns->load * SCHED_POWER_SCALE) / ns->power; ns->capacity = DIV_ROUND_CLOSEST(ns->power, SCHED_POWER_SCALE); ns->has_capacity = (ns->nr_running < ns->capacity); |