[PATCH] sched/fair: Optimize vlag entity placement

[Fernand Sieber <sieberf@amazon.com>]

Optimize for common path when placing an entity with no lag.
Since adjusting a zero lag is always going to produce a zero lag regardless
of the local load, don't bother about calaculating the adjusting factor.

Signed-off-by: Fernand Sieber <sieberf@amazon.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8a5b1ae0aa55..e78272c87274 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5190,7 +5190,7 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	 *
 	 * EEVDF: placement strategy #1 / #2
 	 */
-	if (sched_feat(PLACE_LAG) && cfs_rq->nr_running) {
+	if (se->vlag && sched_feat(PLACE_LAG) && cfs_rq->nr_running) {
 		struct sched_entity *curr = cfs_rq->curr;
 		unsigned long load;
 
-- 
2.40.1