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sched: fix stale value in average load per task
Impact: fix load balancer load average calculation accuracy 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@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -1456,6 +1456,8 @@ static unsigned long cpu_avg_load_per_task(int cpu)
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if (rq->nr_running)
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rq->avg_load_per_task = rq->load.weight / rq->nr_running;
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else
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rq->avg_load_per_task = 0;
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return rq->avg_load_per_task;
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}
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