netdev - [PATCH net-next 0/6] net: avoid slow rcu synchronizations in cleanup

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Date: Fri,  9 Feb 2024 15:30:55 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: David Ahern <dsahern@...nel.org>, Pablo Neira Ayuso <pablo@...filter.org>, 
	Florian Westphal <fw@...len.de>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 0/6] net: avoid slow rcu synchronizations in cleanup_net()

RTNL is a contended mutex, we prefer to expedite rcu synchronizations
in contexts we hold RTNL.

Similarly, cleanup_net() is a single threaded critical component and
should also use synchronize_rcu_expedited() even when not holding RTNL.

First patch removes a barrier with no clear purpose in ipv6_mc_down()

Eric Dumazet (6):
  ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down()
  net: use synchronize_net() in dev_change_name()
  bridge: vlan: use synchronize_net() when holding RTNL
  ipv4/fib: use synchronize_net() when holding RTNL
  net: use synchronize_rcu_expedited in cleanup_net()
  netfilter: conntrack: expedite rcu in nf_conntrack_cleanup_net_list

 net/bridge/br_vlan.c              | 4 ++--
 net/core/dev.c                    | 2 +-
 net/core/net_namespace.c          | 2 +-
 net/ipv4/fib_trie.c               | 2 +-
 net/ipv6/mcast.c                  | 1 -
 net/netfilter/nf_conntrack_core.c | 2 +-
 6 files changed, 6 insertions(+), 7 deletions(-)

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2.43.0.687.g38aa6559b0-goog