netdev - Re: [PATCH net-next RFC 3/4] vhost: interrupt coalescing support

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Date:   Mon, 6 Mar 2017 17:28:07 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        netdev@...r.kernel.org
Cc:     mst@...hat.com, Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next RFC 3/4] vhost: interrupt coalescing support



On 2017年03月03日 22:39, Willem de Bruijn wrote:
> +void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq);
> +static enum hrtimer_restart vhost_coalesce_timer(struct hrtimer *timer)
> +{
> +	struct vhost_virtqueue *vq =
> +		container_of(timer, struct vhost_virtqueue, ctimer);
> +
> +	if (mutex_trylock(&vq->mutex)) {
> +		vq->coalesce_frames = vq->max_coalesce_frames;
> +		vhost_signal(vq->dev, vq);
> +		mutex_unlock(&vq->mutex);
> +	}
> +
> +	/* TODO: restart if lock failed and not held by handle_tx */
> +	return HRTIMER_NORESTART;
> +}
> +

Then we may lose an interrupt forever if no new tx request? I believe we 
need e.g vhost_poll_queue() here.

Thanks