netdev - [PATCH net-next 2/2] net: SOCKWQ_ASYNC

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Date:	Mon, 25 Apr 2016 10:39:34 -0700
From:	Eric Dumazet <edumazet@...gle.com>
To:	"David S . Miller" <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 2/2] net: SOCKWQ_ASYNC_WAITDATA optimizations

SOCKWQ_ASYNC_WAITDATA is set/cleared in sk_wait_data()
and equivalent functions, so that sock_wake_async() can send
a SIGIO only when necessary.

Since these atomic operations are really not needed unless
socket expressed interest in FASYNC, we can omit them in most
cases.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/sock.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 0f48aad9f8e8..3df778ccaa82 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1940,7 +1940,8 @@ static inline unsigned long sock_wspace(struct sock *sk)
  */
 static inline void sk_set_bit(int nr, struct sock *sk)
 {
-	if (nr == SOCKWQ_ASYNC_NOSPACE && !sock_flag(sk, SOCK_FASYNC))
+	if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
+	    !sock_flag(sk, SOCK_FASYNC))
 		return;
 
 	set_bit(nr, &sk->sk_wq_raw->flags);
@@ -1948,7 +1949,8 @@ static inline void sk_set_bit(int nr, struct sock *sk)
 
 static inline void sk_clear_bit(int nr, struct sock *sk)
 {
-	if (nr == SOCKWQ_ASYNC_NOSPACE && !sock_flag(sk, SOCK_FASYNC))
+	if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
+	    !sock_flag(sk, SOCK_FASYNC))
 		return;
 
 	clear_bit(nr, &sk->sk_wq_raw->flags);
-- 
2.8.0.rc3.226.g39d4020