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Commit 4be73522 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
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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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9317bb69

include/net/sock.h

+4 −2
Original line number Diff line number Diff line
@@ -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);