linux-kernel - Re: [PATCH v2] loop: Limit the number of requests in the bio list

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Date:	Thu, 08 Nov 2012 16:53:01 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	axboe@...nel.dk, dchinner@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] loop: Limit the number of requests in the bio list

Lukas Czerner <lczerner@...hat.com> writes:

> +	if (lo->lo_bio_count >= lo->lo_queue->nr_requests) {
> +		unsigned int nr;
> +		spin_unlock_irq(&lo->lo_lock);
> +		nr = lo->lo_queue->nr_requests - (lo->lo_queue->nr_requests/8);
> +		wait_event_interruptible(lo->lo_req_wait,
> +					 lo->lo_bio_count < nr);
> +		spin_lock_irq(&lo->lo_lock);
> +	}

So, blk_queue_make_request already initialized q->nr_congestion_on and
q->nr_congestion_off.  Is there a reason you didn't simply use
queue_congestion_on_threshold and queue_congestion_off_threshold?

Cheers,
Jeff
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