[PATCH net-next 0/2 v1] netns: uevent performance tweaks

[Christian Brauner <christian.brauner@ubuntu.com>]

Hey everyone,

This is v1 of "netns: uevent performance tweaks". Like Eric requested, I
did extensive testing that prove significant performance improvements
when using per-netns uevent sequence numbers with decoupled locks. The
results and test descriptions were added to the commit message of
[PATCH 2/2 v1] netns: isolate seqnums to use per-netns locks.

This series deals with a bunch of performance improvements when sending
out uevents that have been extensively discussed here:
https://lkml.org/lkml/2018/4/10/592

- Only record uevent sockets from network namespaces owned by the
  initial user namespace in the global uevent socket list.
  Eric, this is the exact patch we agreed upon in
  https://lkml.org/lkml/2018/4/10/592.
  A very detailed rationale is present in the commit message for
  [PATCH 1/2] netns: restrict uevents
- Decouple the locking for network namespaces in the global uevent
  socket list from the locking for network namespaces not in the global
  uevent socket list.
  A very detailed rationale including performance test results is
  present in the commit message for
  [PATCH 2/2] netns: isolate seqnums to use per-netns locks

Thanks!
Christian

Christian Brauner (2):
  netns: restrict uevents
  netns: isolate seqnums to use per-netns locks

 include/linux/kobject.h     |   2 +
 include/net/net_namespace.h |   3 +
 kernel/ksysfs.c             |  11 +++-
 lib/kobject_uevent.c        | 122 ++++++++++++++++++++++++++++--------
 net/core/net_namespace.c    |  14 +++++
 5 files changed, 126 insertions(+), 26 deletions(-)

-- 
2.17.0