Commit 9dc20c5f authored May 12, 2009 by John Dykstra Committed by David S. Miller May 17, 2009

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>

parent d44b5e07

net/core/stream.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -33,7 +33,8 @@ void sk_stream_write_space(struct sock *sk)
		clear_bit(SOCK_NOSPACE, &sock->flags);

		if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
		wake_up_interruptible(sk->sk_sleep);
		wake_up_interruptible_poll(sk->sk_sleep, POLLOUT \|
		POLLWRNORM \| POLLWRBAND);
		if (sock->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
		sock_wake_async(sock, SOCK_WAKE_SPACE, POLL_OUT);
		}