Commit 67426b75 authored Oct 29, 2010 by Eric Dumazet Committed by David S. Miller Nov 08, 2010

af_unix: use keyed wakeups



Instead of wakeup all sleepers, use wake_up_interruptible_sync_poll() to
wakeup only ones interested into writing the socket.

This patch is a specialization of commit 37e5540b (epoll keyed
wakeups: make sockets use keyed wakeups).

On a test program provided by Alan Crequy :

Before:
real    0m3.101s
user    0m0.000s
sys     0m6.104s

After:

real	0m0.211s
user	0m0.000s
sys	0m0.208s

Reported-by: Alban Crequy <alban.crequy@collabora.co.uk>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent fc766e4c

net/unix/af_unix.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -316,7 +316,8 @@ static void unix_write_space(struct sock *sk)
		if (unix_writable(sk)) {
		wq = rcu_dereference(sk->sk_wq);
		if (wq_has_sleeper(wq))
		wake_up_interruptible_sync(&wq->wait);
		wake_up_interruptible_sync_poll(&wq->wait,
		POLLOUT \| POLLWRNORM \| POLLWRBAND);
		sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
		}
		rcu_read_unlock();
		@@ -1710,7 +1711,8 @@ static int unix_dgram_recvmsg(struct kiocb iocb, struct socket sock,
		goto out_unlock;
		}

		wake_up_interruptible_sync(&u->peer_wait);
		wake_up_interruptible_sync_poll(&u->peer_wait,
		POLLOUT \| POLLWRNORM \| POLLWRBAND);

		if (msg->msg_name)
		unix_copy_addr(msg, skb->sk);

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