[v2,net-next,0/6] af_unix: Introduce per-netns socket hash table.

Message

Kuniyuki Iwashima June 20, 2022, 6:51 p.m. UTC

This series replaces unix_socket_table with a per-netns hash table and
reduces lock contention and time on iterating over the list.

Note the 3rd-6th patches can be a single patch, but for ease of review,
they are split into small changes without breakage.


Changes:
  v2:
    3rd:
      * Update changelog
      * Remove holes from per-netns hash table structure
      * Use kvmalloc_array() instead of kmalloc() (Eric Dumazet)
      * Remove unnecessary parts in af_unix_init() (Eric Dumazet)
      * Move `err_sysctl` label into ifdef block (kernel test robot)
      * Remove struct netns_unix from struct net if CONFIG_UNIX is disabled
    4th:
      * Use spin_lock_nested() (kernel test robot)

  v1: https://lore.kernel.org/netdev/[e-mail]/


Kuniyuki Iwashima (6):
  af_unix: Clean up some sock_net() uses.
  af_unix: Include the whole hash table size in UNIX_HASH_SIZE.
  af_unix: Define a per-netns hash table.
  af_unix: Acquire/Release per-netns hash table's locks.
  af_unix: Put a socket into a per-netns hash table.
  af_unix: Remove unix_table_locks.

 include/net/af_unix.h       |   5 +-
 include/net/net_namespace.h |   2 +
 include/net/netns/unix.h    |   6 +
 net/unix/af_unix.c          | 216 +++++++++++++++++++-----------------
 net/unix/diag.c             |  46 ++++----
 5 files changed, 145 insertions(+), 130 deletions(-)