net: keep name_hlist close to name
__dev_get_by_name() is slow because pm_qos_req has been inserted between
name[] and name_hlist, adding cache misses.
pm_qos_req has nothing to do at the beginning of struct net_device
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d94cb14..a0b84e3 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1046,10 +1046,9 @@
*/
char name[IFNAMSIZ];
- struct pm_qos_request pm_qos_req;
-
- /* device name hash chain */
+ /* device name hash chain, please keep it close to name[] */
struct hlist_node name_hlist;
+
/* snmp alias */
char *ifalias;
@@ -1322,6 +1321,8 @@
/* group the device belongs to */
int group;
+
+ struct pm_qos_request pm_qos_req;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)
