On Thu, Apr 28, 2016 at 07:13:39PM +0200, Florian Westphal wrote:

[ CCing netdev so netns folks can have a look too ]

This patch series removes the per-netns connection tracking tables.
All conntrack objects are then stored in one global global table.

This avoids the infamous 'vmalloc' when lots of namespaces are used:
We no longer allocate a new conntrack table for each namespace (with 64k
size this saves 512kb of memory per netns).

- net namespace address is made part of conntrack hash, to spread
  conntracks over entire table even if netns has overlapping ip addresses.
- lookup and iterators net_eq() to skip conntracks living in a different
  namespace.

Only the main conntrack table is converted here:
NAT bysrc and expectation hashes are still per namespace (will be unified
in a followup series).  Also, this retains the per-namespace kmem cache
for the conntrack objects.  This will also be resolved in a followup series.

This rework in important, I'm going to place this batch in the tree so
you can keep working on this. Thanks.