Re: [PATCH] netfilter: use per-cpu spinlock rather than RCU (v3)

[Patrick McHardy]

Eric Dumazet wrote:
> Stephen Hemminger a écrit :
> > This is an alternative version of ip/ip6/arp tables locking using
> > per-cpu locks.  This avoids the overhead of synchronize_net() during
> > update but still removes the expensive rwlock in earlier versions.
> >
> > The idea for this came from an earlier version done by Eric Dumazet.
> > Locking is done per-cpu, the fast path locks on the current cpu
> > and updates counters.  The slow case involves acquiring the locks on
> > all cpu's.
> >
> > The mutex that was added for 2.6.30 in xt_table is unnecessary since
> > there already is a mutex for xt[af].mutex that is held.
> >
> > Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxxxx>
> >
> > ---
> >  include/linux/netfilter/x_tables.h |    5 -
> >  net/ipv4/netfilter/arp_tables.c    |  112 +++++++++------------------------
> >  net/ipv4/netfilter/ip_tables.c     |  123 +++++++++++--------------------------
> >  net/ipv6/netfilter/ip6_tables.c    |  119 +++++++++++------------------------
> >  net/netfilter/x_tables.c           |   28 --------
> >  5 files changed, 110 insertions(+), 277 deletions(-)
>
> Tested successfuly on my dev machine, thanks Stephen.
>
> Signed-off-by: Eric Dumazet <dada1@xxxxxxxxxxxxx>

Applied, thanks everyone. I'll give it some testing myself and
will send it upstream tonight.
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