linux-kernel - [PATCH 3/3] vhost-net: use lock_sock_fast() in peek_head

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Message-ID: <20110117081117.18900.48672.stgit@dhcp-91-7.nay.redhat.com.englab.nay.redhat.com>
Date:	Mon, 17 Jan 2011 16:11:17 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	virtualization@...ts.osdl.org, netdev@...r.kernel.org,
	kvm@...r.kernel.org, mst@...hat.com
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] vhost-net: use lock_sock_fast() in peek_head_len()

We can use lock_sock_fast() instead of lock_sock() in order to get
speedup in peek_head_len().

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vhost/net.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index c32a2e4..50b622a 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -211,12 +211,12 @@ static int peek_head_len(struct sock *sk)
 {
 	struct sk_buff *head;
 	int len = 0;
+	bool slow = lock_sock_fast(sk);
 
-	lock_sock(sk);
 	head = skb_peek(&sk->sk_receive_queue);
 	if (head)
 		len = head->len;
-	release_sock(sk);
+	unlock_sock_fast(sk, slow);
 	return len;
 }
 

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