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-rw-r--r--kernel/sched/fair.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7760c2ad3162..ec32c26d7fb6 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1436,8 +1436,15 @@ static int task_numa_migrate(struct task_struct *p)
/* Try to find a spot on the preferred nid. */
task_numa_find_cpu(&env, taskimp, groupimp);
- /* No space available on the preferred nid. Look elsewhere. */
- if (env.best_cpu == -1) {
+ /*
+ * Look at other nodes in these cases:
+ * - there is no space available on the preferred_nid
+ * - the task is part of a numa_group that is interleaved across
+ * multiple NUMA nodes; in order to better consolidate the group,
+ * we need to check other locations.
+ */
+ if (env.best_cpu == -1 || (p->numa_group &&
+ nodes_weight(p->numa_group->active_nodes) > 1)) {
for_each_online_node(nid) {
if (nid == env.src_nid || nid == p->numa_preferred_nid)
continue;

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