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netfilter: nf_conntrack: speed up module removal path if netns in use 

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>
This commit is contained in:
Vladimir Davydov 2013-03-13 23:40:14 +00:00 committed by Pablo Neira Ayuso
parent 493763684f
commit dece40e848
3 changed files with 43 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/netfilter/nf_conntrack_core.h
View File

@ -27,6 +27,7 @@ extern unsigned int nf_conntrack_in(struct net *net,
extern int nf_conntrack_init_net(struct net *net);
extern void nf_conntrack_cleanup_net(struct net *net);
extern void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);
extern int nf_conntrack_proto_pernet_init(struct net *net);
extern void nf_conntrack_proto_pernet_fini(struct net *net);

46
net/netfilter/nf_conntrack_core.c
View File

@ -1365,30 +1365,48 @@ void nf_conntrack_cleanup_end(void)
*/
void nf_conntrack_cleanup_net(struct net *net)
{
LIST_HEAD(single);
list_add(&net->exit_list, &single);
nf_conntrack_cleanup_net_list(&single);
}
void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list)
{
int busy;
struct net *net;
/*
* This makes sure all current packets have passed through
* netfilter framework. Roll on, two-stage module
* delete...
*/
synchronize_net();
i_see_dead_people:
nf_ct_iterate_cleanup(net, kill_all, NULL);
nf_ct_release_dying_list(net);
if (atomic_read(&net->ct.count) != 0) {
i_see_dead_people:
busy = 0;
list_for_each_entry(net, net_exit_list, exit_list) {
nf_ct_iterate_cleanup(net, kill_all, NULL);
nf_ct_release_dying_list(net);
if (atomic_read(&net->ct.count) != 0)
busy = 1;
}
if (busy) {
schedule();
goto i_see_dead_people;
}
nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
nf_conntrack_proto_pernet_fini(net);
nf_conntrack_helper_pernet_fini(net);
nf_conntrack_ecache_pernet_fini(net);
nf_conntrack_tstamp_pernet_fini(net);
nf_conntrack_acct_pernet_fini(net);
nf_conntrack_expect_pernet_fini(net);
kmem_cache_destroy(net->ct.nf_conntrack_cachep);
kfree(net->ct.slabname);
free_percpu(net->ct.stat);
list_for_each_entry(net, net_exit_list, exit_list) {
nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
nf_conntrack_proto_pernet_fini(net);
nf_conntrack_helper_pernet_fini(net);
nf_conntrack_ecache_pernet_fini(net);
nf_conntrack_tstamp_pernet_fini(net);
nf_conntrack_acct_pernet_fini(net);
nf_conntrack_expect_pernet_fini(net);
kmem_cache_destroy(net->ct.nf_conntrack_cachep);
kfree(net->ct.slabname);
free_percpu(net->ct.stat);
}
}
void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls)

16
net/netfilter/nf_conntrack_standalone.c
View File

@ -545,16 +545,20 @@ out_init:
return ret;
}
static void nf_conntrack_pernet_exit(struct net *net)
static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
{
nf_conntrack_standalone_fini_sysctl(net);
nf_conntrack_standalone_fini_proc(net);
nf_conntrack_cleanup_net(net);
struct net *net;
list_for_each_entry(net, net_exit_list, exit_list) {
nf_conntrack_standalone_fini_sysctl(net);
nf_conntrack_standalone_fini_proc(net);
}
nf_conntrack_cleanup_net_list(net_exit_list);
}
static struct pernet_operations nf_conntrack_net_ops = {
.init = nf_conntrack_pernet_init,
.exit = nf_conntrack_pernet_exit,
.init = nf_conntrack_pernet_init,
.exit_batch = nf_conntrack_pernet_exit,
};
static int __init nf_conntrack_standalone_init(void)