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| author | Eric W. Biederman <ebiederm@xmission.com> | 2009-12-03 02:29:09 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-12-03 12:23:47 -0800 |
| commit | b099ce2602d806deb41caaa578731848995cdb2a (patch) | |
| tree | 7541d0d59c73e6b6274d420b8a3ec35d85ca5f2d /net/ipv4 | |
| parent | 575f4cd5a5b639457747434dbe18d175fa767db4 (diff) | |
| download | lwn-b099ce2602d806deb41caaa578731848995cdb2a.tar.gz lwn-b099ce2602d806deb41caaa578731848995cdb2a.zip | |
net: Batch inet_twsk_purge
This function walks the whole hashtable so there is no point in
passing it a network namespace. Instead I purge all timewait
sockets from dead network namespaces that I find. If the namespace
is one of the once I am trying to purge I am guaranteed no new timewait
sockets can be formed so this will get them all. If the namespace
is one I am not acting for it might form a few more but I will
call inet_twsk_purge again and shortly to get rid of them. In
any even if the network namespace is dead timewait sockets are
useless.
Move the calls of inet_twsk_purge into batch_exit routines so
that if I am killing a bunch of namespaces at once I will just
call inet_twsk_purge once and save a lot of redundant unnecessary
work.
My simple 4k network namespace exit test the cleanup time dropped from
roughly 8.2s to 1.6s. While the time spent running inet_twsk_purge fell
to about 2ms. 1ms for ipv4 and 1ms for ipv6.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/inet_timewait_sock.c | 10 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 11 |
2 files changed, 13 insertions, 8 deletions
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c index d38ca7c77b93..31f931ef3daf 100644 --- a/net/ipv4/inet_timewait_sock.c +++ b/net/ipv4/inet_timewait_sock.c @@ -421,7 +421,7 @@ out: EXPORT_SYMBOL_GPL(inet_twdr_twcal_tick); -void inet_twsk_purge(struct net *net, struct inet_hashinfo *hashinfo, +void inet_twsk_purge(struct inet_hashinfo *hashinfo, struct inet_timewait_death_row *twdr, int family) { struct inet_timewait_sock *tw; @@ -436,15 +436,15 @@ restart_rcu: restart: sk_nulls_for_each_rcu(sk, node, &head->twchain) { tw = inet_twsk(sk); - if (!net_eq(twsk_net(tw), net) || - tw->tw_family != family) + if ((tw->tw_family != family) || + atomic_read(&twsk_net(tw)->count)) continue; if (unlikely(!atomic_inc_not_zero(&tw->tw_refcnt))) continue; - if (unlikely(!net_eq(twsk_net(tw), net) || - tw->tw_family != family)) { + if (unlikely((tw->tw_family != family) || + atomic_read(&twsk_net(tw)->count))) { inet_twsk_put(tw); goto restart; } diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 59c911f3889d..fee9aabd5aa1 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2529,12 +2529,17 @@ static int __net_init tcp_sk_init(struct net *net) static void __net_exit tcp_sk_exit(struct net *net) { inet_ctl_sock_destroy(net->ipv4.tcp_sock); - inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET); +} + +static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) +{ + inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); } static struct pernet_operations __net_initdata tcp_sk_ops = { - .init = tcp_sk_init, - .exit = tcp_sk_exit, + .init = tcp_sk_init, + .exit = tcp_sk_exit, + .exit_batch = tcp_sk_exit_batch, }; void __init tcp_v4_init(void) |