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Date: Tue, 29 Mar 2022 09:49:32 +0200 From: Stefano Garzarella <sgarzare@...hat.com> To: Xianting Tian <xianting.tian@...ux.alibaba.com> Cc: mst@...hat.com, jasowang@...hat.com, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/2] virtio_ring: remove unnecessary to_vvq call in vring hot path On Mon, Mar 28, 2022 at 06:58:16PM +0800, Xianting Tian wrote: >It passes '_vq' to virtqueue_use_indirect(), which still calls >to_vvq to get 'vq', let's directly pass 'vq'. It can avoid >unnecessary call of to_vvq in hot path. > >Signed-off-by: Xianting Tian <xianting.tian@...ux.alibaba.com> >--- > drivers/virtio/virtio_ring.c | 8 +++----- > 1 file changed, 3 insertions(+), 5 deletions(-) Reviewed-by: Stefano Garzarella <sgarzare@...hat.com> > >diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c >index 962f1477b1fa..d597fc0874ec 100644 >--- a/drivers/virtio/virtio_ring.c >+++ b/drivers/virtio/virtio_ring.c >@@ -205,11 +205,9 @@ struct vring_virtqueue { > > #define to_vvq(_vq) container_of(_vq, struct vring_virtqueue, vq) > >-static inline bool virtqueue_use_indirect(struct virtqueue *_vq, >+static inline bool virtqueue_use_indirect(struct vring_virtqueue *vq, > unsigned int total_sg) > { >- struct vring_virtqueue *vq = to_vvq(_vq); >- > /* > * If the host supports indirect descriptor tables, and we have multiple > * buffers, then go indirect. FIXME: tune this threshold >@@ -507,7 +505,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > > head = vq->free_head; > >- if (virtqueue_use_indirect(_vq, total_sg)) >+ if (virtqueue_use_indirect(vq, total_sg)) > desc = alloc_indirect_split(_vq, total_sg, gfp); > else { > desc = NULL; >@@ -1194,7 +1192,7 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq, > > BUG_ON(total_sg == 0); > >- if (virtqueue_use_indirect(_vq, total_sg)) { >+ if (virtqueue_use_indirect(vq, total_sg)) { > err = virtqueue_add_indirect_packed(vq, sgs, total_sg, out_sgs, > in_sgs, data, gfp); > if (err != -ENOMEM) { >-- >2.17.1 >
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