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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: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20220630153221.83371-3-sgarzare@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Stefano Garzarella 2022-06-30 17:32:20 +02:00 committed by Michael S. Tsirkin
parent 42a84c09ef
commit 9c4df0900f
1 changed files with 10 additions and 0 deletions
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10
drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
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@ -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)