net: unix: Align send data_len up to PAGE_SIZE

Using whole of allocated pages reduces requested skb->data size.
This is just a little more thriftily allocation.

netperf does not show difference with the current performance.

Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index bb7e8ba821f44014d65f3669e017b8c9cca54f53..7b9114e0a5b14949e11f312e34a8b5b26c5a5a39 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1492,10 +1492,14 @@ static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
        if (len > sk->sk_sndbuf - 32)
                goto out;
 
-       if (len > SKB_MAX_ALLOC)
+       if (len > SKB_MAX_ALLOC) {
                data_len = min_t(size_t,
                                 len - SKB_MAX_ALLOC,
                                 MAX_SKB_FRAGS * PAGE_SIZE);
+               data_len = PAGE_ALIGN(data_len);
+
+               BUILD_BUG_ON(SKB_MAX_ALLOC < PAGE_SIZE);
+       }
 
        skb = sock_alloc_send_pskb(sk, len - data_len, data_len,
                                   msg->msg_flags & MSG_DONTWAIT, &err,
@@ -1670,6 +1674,8 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
 
                data_len = max_t(int, 0, size - SKB_MAX_HEAD(0));
 
+               data_len = min_t(size_t, size, PAGE_ALIGN(data_len));
+
                skb = sock_alloc_send_pskb(sk, size - data_len, data_len,
                                           msg->msg_flags & MSG_DONTWAIT, &err,
                                           get_order(UNIX_SKB_FRAGS_SZ));