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net: use synchronize_rcu_expedited in cleanup_net()

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cleanup_net() is calling synchronize_rcu() right before
acquiring RTNL.

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 fast, in order to free memory and various
sysfs and procfs entries as fast as possible.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2024-02-09 15:31:00 +00:00 committed by David S. Miller
parent 2cd0c51e3b
commit 78c3253f27
1 changed files with 1 additions and 1 deletions
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2
net/core/net_namespace.c
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@ -622,7 +622,7 @@ static void cleanup_net(struct work_struct *work)
* the rcu_barrier() below isn't sufficient alone.
* Also the pre_exit() and exit() methods need this barrier.
*/
synchronize_rcu();
synchronize_rcu_expedited();
rtnl_lock();
list_for_each_entry_reverse(ops, &pernet_list, list) {