On 30 March 2013 15:34, Alex Shi <alex....@intel.com> wrote:
> Old function count the runnable avg on rq's nr_running even there is
> only rt task in rq. That is incorrect, so correct it to cfs_rq's
> nr_running.
>
> Signed-off-by: Alex Shi <alex....@intel.com>
> ---
> kernel/sched/fair.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 2881d42..026e959 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -2829,7 +2829,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p,
> int flags)
> }
>
> if (!se) {
> - update_rq_runnable_avg(rq, rq->nr_running);
> + update_rq_runnable_avg(rq, rq->cfs.nr_running);
A RT task that preempts your CFS task will be accounted in the
runnable_avg fields. So whatever you do, RT task will impact your
runnable_avg statistics. Instead of trying to get only CFS tasks, you
should take into account all tasks activity in the rq.
Vincent
> inc_nr_running(rq);
> }
> hrtick_update(rq);
> --
> 1.7.12
>
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