[PATCH][mmotm] Sched fix stale value in average load per task

[Balbir Singh]

cpu_avg_load_per_task() returns a stale value when nr_running is 0. It returns
an older stale (caculated when nr_running was non zero) value. This patch
returns and sets rq->avg_load_per_task to zero when nr_running is 0.

Compile and boot tested on a x86_64 box.

Signed-off-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
---

 kernel/sched.c |    2 ++
 1 file changed, 2 insertions(+)

diff -puN kernel/sched.c~sched-fix-stale-load-avg kernel/sched.c
--- linux-2.6.28-rc4/kernel/sched.c~sched-fix-stale-load-avg	2008-11-12 15:55:38.000000000 +0530
+++ linux-2.6.28-rc4-balbir/kernel/sched.c	2008-11-12 15:56:09.000000000 +0530
@@ -1430,6 +1430,8 @@ static unsigned long cpu_avg_load_per_ta
 
 	if (rq->nr_running)
 		rq->avg_load_per_task = rq->load.weight / rq->nr_running;
+	else
+		rq->avg_load_per_task = 0;
 
 	return rq->avg_load_per_task;
 }
_

-- 
	Balbir
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