sched: wakeup-buddy tasks are cache-hot

Wakeup-buddy tasks are cache-hot - this makes it a bit harder
for the load-balancer to tear them apart. (but it's still possible,
if the load is sufficiently assymetric)

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index adbd475cfd2556e5c28591cb103de399111c64a6..3f7c5eb254e205c24bc95bf5ac264e28d918d9b8 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1396,6 +1396,12 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
 {
        s64 delta;
 
+       /*
+        * Buddy candidates are cache hot:
+        */
+       if (&p->se == cfs_rq_of(&p->se)->next)
+               return 1;
+
        if (p->sched_class != &fair_sched_class)
                return 0;