Re: [PATCH RFC v2 8/8] blk-mq-tag: allow shared queue/hctx to get more driver tags

[Bart Van Assche]

On 10/21/23 08:48, Yu Kuai wrote:
> +	if (!busy) {
> +		ctl->timer_running = false;
> +	} else {
> +		ctl->timer.expires = jiffies + HZ;
> +		add_timer(&ctl->timer);
> +	}
> +	spin_unlock_irq(&tags->lock);

[ ... ]

> +inc_busy:
> +	atomic_inc(&info->busy_count);
> +	if (!tags->ctl.timer_running &&
> +	    try_cmpxchg_relaxed(&tags->ctl.timer_running, &timer_running, true)) {
> +		tags->ctl.timer.expires = jiffies + HZ;
> +		add_timer(&tags->ctl.timer);
> +	}
>   }

So the choice has been made to let the timer expire after one second? I
think the choice of the timer value is important enough to mention it in
the patch description.

Thanks,

Bart.