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netfilter: conntrack: expedite rcu in nf_conntrack_cleanup_net_list

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nf_conntrack_cleanup_net_list() is calling synchronize_net()
while RTNL is not held. This effectively calls synchronize_rcu().

synchronize_rcu() is much slower than synchronize_rcu_expedited(),
and cleanup_net() is currently single threaded. In many workloads
we want cleanup_net() to be faster, in order to free memory and various
sysfs and procfs entries as fast as possible.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@netfilter.org>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2024-02-09 15:31:01 +00:00 • committed by David S. Miller
parent 78c3253f27
commit 1ebb85f9c0
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_conntrack_core.c
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@ -2530,7 +2530,7 @@ void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list)
* netfilter framework. Roll on, two-stage module
* delete...
*/
synchronize_net();
synchronize_rcu_expedited();
i_see_dead_people:
busy = 0;
list_for_each_entry(net, net_exit_list, exit_list) {