linux-kernel - [patch 5/6] epoll keyed wakeups v2 - make eventfd use keyed wakeups

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Date:	Sun, 01 Feb 2009 12:04:23 -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 5/6] epoll keyed wakeups v2 - make eventfd use keyed wakeups

The following patch introduces keyed event wakeups inside the eventfd code.



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


- Davide


---
 fs/eventfd.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6.mod/fs/eventfd.c
===================================================================
--- linux-2.6.mod.orig/fs/eventfd.c	2009-01-31 14:55:13.000000000 -0800
+++ linux-2.6.mod/fs/eventfd.c	2009-01-31 15:36:00.000000000 -0800
@@ -50,7 +50,7 @@ int eventfd_signal(struct file *file, in
 		n = (int) (ULLONG_MAX - ctx->count);
 	ctx->count += n;
 	if (waitqueue_active(&ctx->wqh))
-		wake_up_locked(&ctx->wqh);
+		wake_up_locked_poll(&ctx->wqh, POLLIN);
 	spin_unlock_irqrestore(&ctx->wqh.lock, flags);
 
 	return n;
@@ -120,7 +120,7 @@ static ssize_t eventfd_read(struct file 
 	if (res > 0) {
 		ctx->count = 0;
 		if (waitqueue_active(&ctx->wqh))
-			wake_up_locked(&ctx->wqh);
+			wake_up_locked_poll(&ctx->wqh, POLLOUT);
 	}
 	spin_unlock_irq(&ctx->wqh.lock);
 	if (res > 0 && put_user(ucnt, (__u64 __user *) buf))
@@ -169,7 +169,7 @@ static ssize_t eventfd_write(struct file
 	if (res > 0) {
 		ctx->count += ucnt;
 		if (waitqueue_active(&ctx->wqh))
-			wake_up_locked(&ctx->wqh);
+			wake_up_locked_poll(&ctx->wqh, POLLIN);
 	}
 	spin_unlock_irq(&ctx->wqh.lock);
 

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