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>
diff --git a/kernel/sched.c b/kernel/sched.c
index a5dd035..5594e65 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -732,13 +732,14 @@
static inline void update_load_add(struct load_weight *lw, unsigned long inc)
{
lw->weight += inc;
- lw->inv_weight = WMULT_CONST / lw->weight;
+ if (sched_feat(FAIR_SLEEPERS))
+ lw->inv_weight = WMULT_CONST / lw->weight;
}
static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
{
lw->weight -= dec;
- if (likely(lw->weight))
+ if (sched_feat(FAIR_SLEEPERS) && likely(lw->weight))
lw->inv_weight = WMULT_CONST / lw->weight;
}
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index a566a45..7041dc6 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -336,6 +336,9 @@
}
curr->vruntime += delta_exec_weighted;
+ if (!sched_feat(FAIR_SLEEPERS))
+ return;
+
if (unlikely(!load))
return;