On Thu, Apr 17, 2014 at 12:05:19PM +0200, Peter Zijlstra wrote:
> +static inline void iowait_start(struct rq *rq)
> +{
> + raw_spin_lock(&rq->iowait_lock);
> + rq->nr_iowait++;
> + raw_spin_unlock(&rq->iowait_lock);
> + current->in_iowait = 1;
> +}
> +
> +static inline void iowait_stop(struct rq *rq)
> +{
> + current->in_iowait = 0;
> + raw_spin_lock(&rq->iowait_lock);
> + rq->nr_iowait--;
> + if (!rq->nr_iowait && rq != this_rq())
> + rq->last_iowait = ktime_get();
> + raw_spin_unlock(&rq->iowait_lock);
> +}
We could actually use lockref here...
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