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tcp: tcp_prequeue() can use keyed wakeups
When TCP frees up write buffer space, avoid waking up tasks that have done a poll() or select() on the same socket specifying read-side events. This is an extension of a read-side patch by Eric Dumazet. Signed-off-by: John Dykstra <john.dykstra1@gmail.com> Acked-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 2 additions and 1 deletions
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@ -33,7 +33,8 @@ void sk_stream_write_space(struct sock *sk)
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clear_bit(SOCK_NOSPACE, &sock->flags);
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if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
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wake_up_interruptible(sk->sk_sleep);
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wake_up_interruptible_poll(sk->sk_sleep, POLLOUT |
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POLLWRNORM | POLLWRBAND);
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if (sock->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
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sock_wake_async(sock, SOCK_WAKE_SPACE, POLL_OUT);
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}
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