On Tue, Mar 13, 2018 at 07:42:41PM +0100, Sebastian Andrzej Siewior wrote:
> +static void blk_queue_usage_counter_release_swork(struct swork_event *sev)
> +{
> + struct request_queue *q =
> + container_of(sev, struct request_queue, mq_pcpu_wake);
> +
> + wake_up_all(&q->mq_freeze_wq);
> +}
> +
> static void blk_queue_usage_counter_release(struct percpu_ref *ref)
> {
> struct request_queue *q =
> container_of(ref, struct request_queue, q_usage_counter);
>
> - wake_up_all(&q->mq_freeze_wq);
> + swork_queue(&q->mq_pcpu_wake);
> }
Depending on if we expect there to actually be wakeups, you could do
something like:
if (wq_has_sleepers(&q->mq_freeze_wq))
swork_queue(&q->mq_pcpu_wake));
avoiding the whole workqueue thing in the case there wasn't anybody
waiting for it. But since I don't know this code, I can't say if it
makes sense or not. Tejun?
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