[PATCH 3/8] sched/eevdf: Handle more short slice waking cases

[Vincent Guittot]

Handle better the cases with several short slice tasks waking up
simultaneously.

Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
---
 kernel/sched/fair.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 92382db1d297..e6eb9a4c03be 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9853,8 +9853,14 @@ static inline bool set_preempt_buddy(struct cfs_rq *cfs_rq, struct sched_entity
 
 static inline bool set_short_buddy(struct cfs_rq *cfs_rq, struct sched_entity *pse)
 {
-	if (cfs_rq->next && cfs_rq->next->slice < pse->slice)
-		return false;
+	if (cfs_rq->next) {
+		if (cfs_rq->next->slice < pse->slice)
+			return false;
+
+		if (cfs_rq->next->slice == pse->slice &&
+		    entity_before(cfs_rq->next, pse))
+			return false;
+	}
 
 	set_next_buddy(cfs_rq, pse);
 	return true;
-- 
2.53.0