Eric Dumazet e67f88dd12 net: dont hold rtnl mutex during netlink dump callbacks ... Four years ago, Patrick made a change to hold rtnl mutex during netlink dump callbacks. I believe it was a wrong move. This slows down concurrent dumps, making good old /proc/net/ files faster than rtnetlink in some situations. This occurred to me because one "ip link show dev ..." was _very_ slow on a workload adding/removing network devices in background. All dump callbacks are able to use RCU locking now, so this patch does roughly a revert of commits : 1c2d670f36 : [RTNETLINK]: Hold rtnl_mutex during netlink dump callbacks 6313c1e099 : [RTNETLINK]: Remove unnecessary locking in dump callbacks This let writers fight for rtnl mutex and readers going full speed. It also takes care of phonet : phonet_route_get() is now called from rcu read section. I renamed it to phonet_route_get_rcu() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Patrick McHardy <kaber@trash.net> Cc: Remi Denis-Courmont <remi.denis-courmont@nokia.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2011-05-02 15:26:28 -07:00
..
gprs.h	Phonet: implement GPRS virtual interface over PEP socket	2008-10-05 11:16:16 -07:00
pep.h	Phonet: allocate sock from accept syscall rather than soft IRQ	2011-03-09 11:59:32 -08:00
phonet.h	Phonet: implement per-socket destination/peer address	2011-02-25 11:19:35 -08:00
pn_dev.h	net: dont hold rtnl mutex during netlink dump callbacks	2011-05-02 15:26:28 -07:00