From fb699dfd426a189fe33b91586c15176a75c8aed0 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 19 Oct 2009 19:18:49 +0000 Subject: net: Introduce dev_get_by_index_rcu() Some workloads hit dev_base_lock rwlock pretty hard. We can use RCU lookups to avoid touching this rwlock. netdevices are already freed after a RCU grace period, so this patch adds no penalty at device dismantle time. dev_ifname() converted to dev_get_by_index_rcu() Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- include/linux/netdevice.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 656110a46e9..ffc3106cc03 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1139,6 +1139,7 @@ extern void netdev_resync_ops(struct net_device *dev); extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev); extern struct net_device *dev_get_by_index(struct net *net, int ifindex); extern struct net_device *__dev_get_by_index(struct net *net, int ifindex); +extern struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); extern int dev_restart(struct net_device *dev); #ifdef CONFIG_NETPOLL_TRAP extern int netpoll_trap(void); -- cgit v1.2.3