net: attempt high order allocations in sock_alloc_send_pskb()

Adding paged frags skbs to af_unix sockets introduced a performance
regression on large sends because of additional page allocations, even
if each skb could carry at least 100% more payload than before.

We can instruct sock_alloc_send_pskb() to attempt high order
allocations.

Most of the time, it does a single page allocation instead of 8.

I added an additional parameter to sock_alloc_send_pskb() to
let other users to opt-in for this new feature on followup patches.

Tested:

Before patch :

$ netperf -t STREAM_STREAM
STREAM STREAM TEST
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 2304  212992  212992    10.00    46861.15

After patch :

$ netperf -t STREAM_STREAM
STREAM STREAM TEST
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 2304  212992  212992    10.00    57981.11

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 51 insertions, 49 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 83667de45ec9..5b6beba494a3 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1741,24 +1741,23 @@ static long sock_wait_for_wmem(struct sock *sk, long timeo)
 
 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
 				     unsigned long data_len, int noblock,
-				     int *errcode)
+				     int *errcode, int max_page_order)
 {
-	struct sk_buff *skb;
+	struct sk_buff *skb = NULL;
+	unsigned long chunk;
 	gfp_t gfp_mask;
 	long timeo;
 	int err;
 	int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+	struct page *page;
+	int i;
 
 	err = -EMSGSIZE;
 	if (npages > MAX_SKB_FRAGS)
 		goto failure;
 
-	gfp_mask = sk->sk_allocation;
-	if (gfp_mask & __GFP_WAIT)
-		gfp_mask |= __GFP_REPEAT;
-
 	timeo = sock_sndtimeo(sk, noblock);
-	while (1) {
+	while (!skb) {
 		err = sock_error(sk);
 		if (err != 0)
 			goto failure;
@@ -1767,50 +1766,52 @@ struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
 		if (sk->sk_shutdown & SEND_SHUTDOWN)
 			goto failure;
 
-		if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
-			skb = alloc_skb(header_len, gfp_mask);
-			if (skb) {
-				int i;
-
-				/* No pages, we're done... */
-				if (!data_len)
-					break;
-
-				skb->truesize += data_len;
-				skb_shinfo(skb)->nr_frags = npages;
-				for (i = 0; i < npages; i++) {
-					struct page *page;
-
-					page = alloc_pages(sk->sk_allocation, 0);
-					if (!page) {
-						err = -ENOBUFS;
-						skb_shinfo(skb)->nr_frags = i;
-						kfree_skb(skb);
-						goto failure;
-					}
-
-					__skb_fill_page_desc(skb, i,
-							page, 0,
-							(data_len >= PAGE_SIZE ?
-							 PAGE_SIZE :
-							 data_len));
-					data_len -= PAGE_SIZE;
-				}
+		if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) {
+			set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+			set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+			err = -EAGAIN;
+			if (!timeo)
+				goto failure;
+			if (signal_pending(current))
+				goto interrupted;
+			timeo = sock_wait_for_wmem(sk, timeo);
+			continue;
+		}
 
-				/* Full success... */
-				break;
-			}
-			err = -ENOBUFS;
+		err = -ENOBUFS;
+		gfp_mask = sk->sk_allocation;
+		if (gfp_mask & __GFP_WAIT)
+			gfp_mask |= __GFP_REPEAT;
+
+		skb = alloc_skb(header_len, gfp_mask);
+		if (!skb)
 			goto failure;
+
+		skb->truesize += data_len;
+
+		for (i = 0; npages > 0; i++) {
+			int order = max_page_order;
+
+			while (order) {
+				if (npages >= 1 << order) {
+					page = alloc_pages(sk->sk_allocation |
+							   __GFP_COMP | __GFP_NOWARN,
+							   order);
+					if (page)
+						goto fill_page;
+				}
+				order--;
+			}
+			page = alloc_page(sk->sk_allocation);
+			if (!page)
+				goto failure;
+fill_page:
+			chunk = min_t(unsigned long, data_len,
+				      PAGE_SIZE << order);
+			skb_fill_page_desc(skb, i, page, 0, chunk);
+			data_len -= chunk;
+			npages -= 1 << order;
 		}
-		set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
-		set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
-		err = -EAGAIN;
-		if (!timeo)
-			goto failure;
-		if (signal_pending(current))
-			goto interrupted;
-		timeo = sock_wait_for_wmem(sk, timeo);
 	}
 
 	skb_set_owner_w(skb, sk);
@@ -1819,6 +1820,7 @@ struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
 interrupted:
 	err = sock_intr_errno(timeo);
 failure:
+	kfree_skb(skb);
 	*errcode = err;
 	return NULL;
 }
@@ -1827,7 +1829,7 @@ EXPORT_SYMBOL(sock_alloc_send_pskb);
 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
 				    int noblock, int *errcode)
 {
-	return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
+	return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
 }
 EXPORT_SYMBOL(sock_alloc_send_skb);