On Wed, 2014-10-15 at 15:25 +0800, Jason Wang wrote:
> Accumulate the sent packets and sent bytes in local variables and perform a
> single u64_stats_update_begin/end() after.
>
> Cc: Rusty Russell <ru...@rustcorp.com.au>
> Cc: Michael S. Tsirkin <m...@redhat.com>
> Signed-off-by: Jason Wang <jasow...@redhat.com>
> ---
> drivers/net/virtio_net.c | 12 ++++++++----
> 1 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 3d0ce44..a4d56b8 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -833,17 +833,21 @@ static void free_old_xmit_skbs(struct send_queue *sq)
> unsigned int len;
> struct virtnet_info *vi = sq->vq->vdev->priv;
> struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
> + u64 tx_bytes = 0, tx_packets = 0;
>
> while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
> pr_debug("Sent skb %p\n", skb);
>
> - u64_stats_update_begin(&stats->tx_syncp);
> - stats->tx_bytes += skb->len;
> - stats->tx_packets++;
> - u64_stats_update_end(&stats->tx_syncp);
> + tx_bytes += skb->len;
> + tx_packets++;
>
> dev_kfree_skb_any(skb);
> }
> +
> + u64_stats_update_begin(&stats->tx_syncp);
> + stats->tx_bytes += tx_bytes;
> + stats->tx_packets =+ tx_packets;
stats->tx_packets += tx_packets;
> + u64_stats_update_end(&stats->tx_syncp);
> }
>
> static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
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