From 9136461ab921fd5066ba6a0de08399e2172f4d71 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 11 Jun 2012 06:36:13 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- include/linux/netdevice.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index d94cb1431519..a0b84e3b087c 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1046,10 +1046,9 @@ struct net_device { */ 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 @@ struct net_device { /* 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)