[PATCH 7/9] sched/fair: Do not try to migrate delayed dequeue task

[Vincent Guittot]

Migrating a delayed dequeued task doesn't help in balancing the number
of runnable tasks in the system.

Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
---
 kernel/sched/fair.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1b4f1b610543..9d80f3a61082 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9405,11 +9405,15 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
 
 	/*
 	 * We do not migrate tasks that are:
-	 * 1) throttled_lb_pair, or
-	 * 2) cannot be migrated to this CPU due to cpus_ptr, or
-	 * 3) running (obviously), or
-	 * 4) are cache-hot on their current CPU.
+	 * 1) delayed dequeued, or
+	 * 2) throttled_lb_pair, or
+	 * 3) cannot be migrated to this CPU due to cpus_ptr, or
+	 * 4) running (obviously), or
+	 * 5) are cache-hot on their current CPU.
 	 */
+	if (p->se.sched_delayed)
+		return 0;
+
 	if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu))
 		return 0;
 
-- 
2.43.0