sched debug: check spread

debug feature: check how well we schedule within a reasonable
vruntime 'spread' range. (note that CPU overload can increase
the spread, so this is not a hard condition, but normal loads
should be within the spread.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index fe1165b226a1..213294fdcd0f 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -250,6 +250,9 @@ struct cfs_rq {
          * It is set to NULL otherwise (i.e when none are currently running).
          */
         struct sched_entity *curr;
+
+        unsigned long nr_spread_over;
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
         struct rq *rq;  /* cpu runqueue to which this cfs_rq is attached */