[patch 01/16] sched: (fixlet) dont update shares twice on on_rq parent

From: Paul Turner
Date: Tue Jun 21 2011 - 03:26:45 EST

In dequeue_task_fair() we bail on dequeue when we encounter a parenting entity
with additional weight. However, we perform a double shares update on this
entity as we continue the shares update traversal from this point, despite
dequeue_entity() having already updated its queuing cfs_rq.
Avoid this by starting from the parent when we resume.

Signed-off-by: Paul Turner <pjt@xxxxxxxxxx>
kernel/sched_fair.c | 3 +++
1 file changed, 3 insertions(+)

Index: tip/kernel/sched_fair.c
--- tip.orig/kernel/sched_fair.c
+++ tip/kernel/sched_fair.c
@@ -1370,6 +1370,9 @@ static void dequeue_task_fair(struct rq
if (task_sleep && parent_entity(se))
+ /* avoid re-evaluating load for this entity */
+ se = parent_entity(se);

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