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>

1 files changed, 51 insertions, 3 deletions

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index ab11b2bee273..d919284f103b 100644
--- 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;
 }