From 9c4df0900f376f28e8e5cca640a10a0085f16b66 Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Thu, 30 Jun 2022 17:32:20 +0200 Subject: vdpa_sim_blk: limit the number of request handled per batch MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Stefano Garzarella Message-Id: <20220630153221.83371-3-sgarzare@redhat.com> Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang --- drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/vdpa/vdpa_sim') diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c index a83a5c76f620..b2d75efec63a 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c @@ -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) -- cgit v1.2.3