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

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Date:   Mon, 23 Oct 2023 13:46:55 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Yu Kuai <yukuai1@...weicloud.com>, hch@....de, kbusch@...nel.org,
        ming.lei@...hat.com, axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH RFC v2 8/8] blk-mq-tag: allow shared queue/hctx to get
 more driver tags

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.