sched: optimize vruntime based scheduling

optimize vruntime based scheduling.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index a566a455816..7041dc69785 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -336,6 +336,9 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
         }
         curr->vruntime += delta_exec_weighted;
 
+        if (!sched_feat(FAIR_SLEEPERS))
+                return;
+
         if (unlikely(!load))
                 return;