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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>
This commit is contained in:
Kirill Tkhai 2014-05-15 19:56:28 +04:00 committed by David S. Miller
parent a188a54d11
commit 31ff6aa5c8
1 changed files with 7 additions and 1 deletions
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8
net/unix/af_unix.c
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@ -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));