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net: SOCKWQ_ASYNC_WAITDATA optimizations

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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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-04-25 10:39:34 -07:00 committed by David S. Miller
parent 9317bb6982
commit 4be735225f
1 changed files with 4 additions and 2 deletions
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6
include/net/sock.h
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@ -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);