From 9dc20c5f78c53bf57fb7874b6e942842e1db20d3 Mon Sep 17 00:00:00 2001 From: John Dykstra Date: Tue, 12 May 2009 15:34:50 +0000 Subject: [PATCH] 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 Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/core/stream.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/core/stream.c b/net/core/stream.c index 8727cead64a..a37debfeb1b 100644 --- a/net/core/stream.c +++ b/net/core/stream.c @@ -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); }