Commit 78c3253f authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: use synchronize_rcu_expedited in cleanup_net() 



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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2cd0c51e

net/core/net_namespace.c

+1 −1
Original line number Diff line number Diff line
@@ -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) {