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The patch introduces nf_conntrack_cleanup_net_list(), which cleanups
nf_conntrack for a list of netns and calls synchronize_net() only once
for them all. This should reduce netns destruction time.
I've measured cleanup time for 1k dummy net ns. Here are the results:
<without the patch>
# modprobe nf_conntrack
# time modprobe -r nf_conntrack
real 0m10.337s
user 0m0.000s
sys 0m0.376s
<with the patch>
# modprobe nf_conntrack
# time modprobe -r nf_conntrack
real 0m5.661s
user 0m0.000s
sys 0m0.216s
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Patrick McHardy <kaber@trash.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
dece40e848