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| author |   Florian Westphal <fw@strlen.de> | 2017-04-24 15:37:39 +0200 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2017-05-01 11:18:54 +0200 |
| commit | 933bd83ed60e80ebb1aeb64a2f7cd3190d2312e2 (patch) | |
| tree | 8432135759dbea3d42610e7014ff45fcb35eaff1 /net/netfilter/nfnetlink_log.c | |
| parent | netfilter: don't attach a nat extension by default (diff) | |
| download | linux-dev-933bd83ed60e80ebb1aeb64a2f7cd3190d2312e2.tar.xz linux-dev-933bd83ed60e80ebb1aeb64a2f7cd3190d2312e2.zip | |
netfilter: batch synchronize_net calls during hook unregister
synchronize_net is expensive and slows down netns cleanup a lot.
We have two APIs to unregister a hook:
nf_unregister_net_hook (which calls synchronize_net())
and
nf_unregister_net_hooks (calls nf_unregister_net_hook in a loop)
Make nf_unregister_net_hook a wapper around new helper
__nf_unregister_net_hook, which unlinks the hook but does not free it.
Then, we can call that helper in nf_unregister_net_hooks and then
call synchronize_net() only once.
Andrey Konovalov reports this change improves syzkaller fuzzing speed at
least twice.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nfnetlink_log.c')
0 files changed, 0 insertions, 0 deletions