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-rw-r--r--kernel/sched/core.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 978bf6f6e0ff..014d4f793313 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1650,7 +1650,12 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
if (cpumask_equal(p->cpus_ptr, new_mask))
goto out;
- dest_cpu = cpumask_any_and(cpu_valid_mask, new_mask);
+ /*
+ * Picking a ~random cpu helps in cases where we are changing affinity
+ * for groups of tasks (ie. cpuset), so that load balancing is not
+ * immediately required to distribute the tasks within their new mask.
+ */
+ dest_cpu = cpumask_any_and_distribute(cpu_valid_mask, new_mask);
if (dest_cpu >= nr_cpu_ids) {
ret = -EINVAL;
goto out;