linux-kernel - [patch 3/6] epoll keyed wakeups v3 - make sockets use keyed wakeups

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Message-ID: <send-serie.davidel@xmailserver.org.21761.1233865421.3>
Date:	Thu, 05 Feb 2009 12:23:39 -0800
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>, David Miller <davem@...emloft.net>
Subject: [patch 3/6] epoll keyed wakeups v3 - make sockets use keyed wakeups

The following patch adds support for event-aware wakeups to
the sockets code. Events are delivered to the wakeup target,
so that epoll can avoid spurious wakeups for non-interesting
events.


Signed-off-by: Davide Libenzi <davidel@...ilserver.org>


- Davide


---
 net/core/sock.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6.mod/net/core/sock.c
===================================================================
--- linux-2.6.mod.orig/net/core/sock.c	2009-02-03 13:43:52.000000000 -0800
+++ linux-2.6.mod/net/core/sock.c	2009-02-03 13:44:02.000000000 -0800
@@ -1628,7 +1628,7 @@ static void sock_def_error_report(struct
 {
 	read_lock(&sk->sk_callback_lock);
 	if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
-		wake_up_interruptible(sk->sk_sleep);
+		wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
 	sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
 	read_unlock(&sk->sk_callback_lock);
 }
@@ -1637,7 +1637,7 @@ static void sock_def_readable(struct soc
 {
 	read_lock(&sk->sk_callback_lock);
 	if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
-		wake_up_interruptible_sync(sk->sk_sleep);
+		wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN);
 	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
 	read_unlock(&sk->sk_callback_lock);
 }
@@ -1651,7 +1651,7 @@ static void sock_def_write_space(struct 
 	 */
 	if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
 		if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
-			wake_up_interruptible_sync(sk->sk_sleep);
+			wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT);
 
 		/* Should agree with poll, otherwise some programs break */
 		if (sock_writeable(sk))

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