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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-10-19 19:18:49 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-10-29 01:42:55 -0700 |
| commit | fb699dfd426a189fe33b91586c15176a75c8aed0 (patch) | |
| tree | c90a8aadc10ac9a9e7b67b2d36ce61853917e3ba /include | |
| parent | e0c5567d06ecf7777b6c46f4d933a0a6e09a44f3 (diff) | |
| download | linux-3.10-fb699dfd426a189fe33b91586c15176a75c8aed0.tar.gz linux-3.10-fb699dfd426a189fe33b91586c15176a75c8aed0.tar.bz2 linux-3.10-fb699dfd426a189fe33b91586c15176a75c8aed0.zip | |
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 <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 1 |
1 files changed, 1 insertions, 0 deletions
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); |