linux

History

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
..
netfilter	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
Kconfig	…
Makefile	…
README	…
TODO	…
af_decnet.c	decnet: Convert to use flowidn where applicable.	2011-03-12 15:08:55 -08:00
dn_dev.c	net: dont hold rtnl mutex during netlink dump callbacks	2011-05-02 15:26:28 -07:00
dn_fib.c	decnet: Convert to use flowidn where applicable.	2011-03-12 15:08:55 -08:00
dn_neigh.c	decnet: RCU conversion and get rid of dev_base_lock	2010-11-08 13:50:08 -08:00
dn_nsp_in.c	Merge branch 'master' of /repos/git/net-next-2.6	2010-04-20 16:02:01 +02:00
dn_nsp_out.c	decnet: Convert to use flowidn where applicable.	2011-03-12 15:08:55 -08:00
dn_route.c	net: Use non-zero allocations in dst_alloc().	2011-04-28 22:26:00 -07:00
dn_rules.c	decnet: Convert to use flowidn where applicable.	2011-03-12 15:08:55 -08:00
dn_table.c	decnet: Don't leak entries when rebuilding zone.	2011-04-17 20:47:07 -07:00
dn_timer.c	…
sysctl_net_decnet.c	net: avoid limits overflow	2010-11-10 12:12:00 -08:00

README

                       Linux DECnet Project
                      ======================

The documentation for this kernel subsystem is available in the
Documentation/networking subdirectory of this distribution and also
on line at http://www.chygwyn.com/DECnet/

Steve Whitehouse <SteveW@ACM.org>