vhost_net: mitigate page reference counting during page frag refill

We do a get_page() which involves a atomic operation. This patch tries
to mitigate a per packet atomic operation by maintaining a reference
bias which is initially USHRT_MAX. Each time a page is got, instead of
calling get_page() we decrease the bias and when we find it's time to
use a new page we will decrease the bias at one time through
__page_cache_drain_cache().

Testpmd(virtio_user + vhost_net) + XDP_DROP on TAP shows about 1.6%
improvement.

Before: 4.63Mpps
After:  4.71Mpps

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index ab11b2b..d919284 100644 (file)
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -141,6 +141,10 @@ struct vhost_net {
        unsigned tx_zcopy_err;
        /* Flush in progress. Protected by tx vq lock. */
        bool tx_flush;
+       /* Private page frag */
+       struct page_frag page_frag;
+       /* Refcount bias of page frag */
+       int refcnt_bias;
 };
 
 static unsigned vhost_net_zcopy_mask __read_mostly;
@@ -637,14 +641,53 @@ static bool tx_can_batch(struct vhost_virtqueue *vq, size_t total_len)
               !vhost_vq_avail_empty(vq->dev, vq);
 }
 
+#define SKB_FRAG_PAGE_ORDER     get_order(32768)
+
+static bool vhost_net_page_frag_refill(struct vhost_net *net, unsigned int sz,
+                                      struct page_frag *pfrag, gfp_t gfp)
+{
+       if (pfrag->page) {
+               if (pfrag->offset + sz <= pfrag->size)
+                       return true;
+               __page_frag_cache_drain(pfrag->page, net->refcnt_bias);
+       }
+
+       pfrag->offset = 0;
+       net->refcnt_bias = 0;
+       if (SKB_FRAG_PAGE_ORDER) {
+               /* Avoid direct reclaim but allow kswapd to wake */
+               pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
+                                         __GFP_COMP | __GFP_NOWARN |
+                                         __GFP_NORETRY,
+                                         SKB_FRAG_PAGE_ORDER);
+               if (likely(pfrag->page)) {
+                       pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
+                       goto done;
+               }
+       }
+       pfrag->page = alloc_page(gfp);
+       if (likely(pfrag->page)) {
+               pfrag->size = PAGE_SIZE;
+               goto done;
+       }
+       return false;
+
+done:
+       net->refcnt_bias = USHRT_MAX;
+       page_ref_add(pfrag->page, USHRT_MAX - 1);
+       return true;
+}
+
 #define VHOST_NET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
 
 static int vhost_net_build_xdp(struct vhost_net_virtqueue *nvq,
                               struct iov_iter *from)
 {
        struct vhost_virtqueue *vq = &nvq->vq;
+       struct vhost_net *net = container_of(vq->dev, struct vhost_net,
+                                            dev);
        struct socket *sock = vq->private_data;
-       struct page_frag *alloc_frag = &current->task_frag;
+       struct page_frag *alloc_frag = &net->page_frag;
        struct virtio_net_hdr *gso;
        struct xdp_buff *xdp = &nvq->xdp[nvq->batched_xdp];
        struct tun_xdp_hdr *hdr;
@@ -665,7 +708,8 @@ static int vhost_net_build_xdp(struct vhost_net_virtqueue *nvq,
 
        buflen += SKB_DATA_ALIGN(len + pad);
        alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES);
-       if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL)))
+       if (unlikely(!vhost_net_page_frag_refill(net, buflen,
+                                                alloc_frag, GFP_KERNEL)))
                return -ENOMEM;
 
        buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
@@ -703,7 +747,7 @@ static int vhost_net_build_xdp(struct vhost_net_virtqueue *nvq,
        xdp->data_end = xdp->data + len;
        hdr->buflen = buflen;
 
-       get_page(alloc_frag->page);
+       --net->refcnt_bias;
        alloc_frag->offset += buflen;
 
        ++nvq->batched_xdp;
@@ -1292,6 +1336,8 @@ static int vhost_net_open(struct inode *inode, struct file *f)
        vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, EPOLLIN, dev);
 
        f->private_data = n;
+       n->page_frag.page = NULL;
+       n->refcnt_bias = 0;
 
        return 0;
 }
@@ -1366,6 +1412,8 @@ static int vhost_net_release(struct inode *inode, struct file *f)
        kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue);
        kfree(n->vqs[VHOST_NET_VQ_TX].xdp);
        kfree(n->dev.vqs);
+       if (n->page_frag.page)
+               __page_frag_cache_drain(n->page_frag.page, n->refcnt_bias);
        kvfree(n);
        return 0;
 }