[PATCH v3 net-next 0/6] af_unix: Introduce per-netns socket hash table.

From: Kuniyuki Iwashima <kuniyu@amazon.com>
To: "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: Amit Shah <aams@amazon.com>,
	Kuniyuki Iwashima <kuniyu@amazon.com>,
	Kuniyuki Iwashima <kuni1840@gmail.com>, <netdev@vger.kernel.org>
Subject: [PATCH v3 net-next 0/6] af_unix: Introduce per-netns socket hash table.
Date: Tue, 21 Jun 2022 10:19:07 -0700	[thread overview]
Message-ID: <20220621171913.73401-1-kuniyu@amazon.com> (raw)

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:
  v3:
    6th:
      * Remove unix_table_locks from comments.
      * Remove missed spin_unlock(&unix_table_locks) in
        unix_lookup_by_ino() (kernel test robot)

  v2: https://lore.kernel.org/netdev/20220620185151.65294-1-kuniyu@amazon.com/
    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/20220616234714.4291-1-kuniyu@amazon.com/

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          | 228 +++++++++++++++++++-----------------
 net/unix/diag.c             |  49 ++++----
 5 files changed, 152 insertions(+), 138 deletions(-)

-- 
2.30.2