Commit 9c4df090 authored by Stefano Garzarella's avatar Stefano Garzarella Committed by Michael S. Tsirkin
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vdpa_sim_blk: limit the number of request handled per batch 



Limit the number of requests (4 per queue as for vdpa_sim_net) handled
in a batch to prevent the worker from using the CPU for too long.

Suggested-by: default avatarEugenio Pérez <eperezma@redhat.com>
Signed-off-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Message-Id: <20220630153221.83371-3-sgarzare@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
parent 42a84c09

drivers/vdpa/vdpa_sim/vdpa_sim_blk.c

+10 −0
Original line number Diff line number Diff line
@@ -197,6 +197,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim, 
static void vdpasim_blk_work(struct work_struct *work)

{

	struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);

	bool reschedule = false;

	int i;



	spin_lock(&vdpasim->lock);
@@ -206,6 +207,7 @@ static void vdpasim_blk_work(struct work_struct *work) 


	for (i = 0; i < VDPASIM_BLK_VQ_NUM; i++) {

		struct vdpasim_virtqueue *vq = &vdpasim->vqs[i];

		int reqs = 0;



		if (!vq->ready)

			continue;
@@ -218,10 +220,18 @@ static void vdpasim_blk_work(struct work_struct *work) 
			if (vringh_need_notify_iotlb(&vq->vring) > 0)

				vringh_notify(&vq->vring);

			local_bh_enable();



			if (++reqs > 4) {

				reschedule = true;

				break;

			}

		}

	}

out:

	spin_unlock(&vdpasim->lock);



	if (reschedule)

		schedule_work(&vdpasim->work);

}



static void vdpasim_blk_get_config(struct vdpasim *vdpasim, void *config)