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authorEric W. Biederman <ebiederm@xmission.com>2009-12-03 02:29:09 +0000
committerDavid S. Miller <davem@davemloft.net>2009-12-03 12:23:47 -0800
commitb099ce2602d806deb41caaa578731848995cdb2a (patch)
tree7541d0d59c73e6b6274d420b8a3ec35d85ca5f2d
parentnet: Use rcu lookups in inet_twsk_purge. (diff)
downloadlinux-dev-b099ce2602d806deb41caaa578731848995cdb2a.tar.xz
linux-dev-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>
-rw-r--r--include/net/inet_timewait_sock.h6
-rw-r--r--net/ipv4/inet_timewait_sock.c10
-rw-r--r--net/ipv4/tcp_ipv4.c11
-rw-r--r--net/ipv6/tcp_ipv6.c11
4 files changed, 24 insertions, 14 deletions
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index 773b10fa38e4..4fd007f34dd5 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -212,14 +212,14 @@ extern void inet_twsk_schedule(struct inet_timewait_sock *tw,
extern void inet_twsk_deschedule(struct inet_timewait_sock *tw,
struct inet_timewait_death_row *twdr);
-extern void inet_twsk_purge(struct net *net, struct inet_hashinfo *hashinfo,
+extern void inet_twsk_purge(struct inet_hashinfo *hashinfo,
struct inet_timewait_death_row *twdr, int family);
static inline
struct net *twsk_net(const struct inet_timewait_sock *twsk)
{
#ifdef CONFIG_NET_NS
- return twsk->tw_net;
+ return rcu_dereference(twsk->tw_net);
#else
return &init_net;
#endif
@@ -229,7 +229,7 @@ static inline
void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
{
#ifdef CONFIG_NET_NS
- twsk->tw_net = net;
+ rcu_assign_pointer(twsk->tw_net, net);
#endif
}
#endif /* _INET_TIMEWAIT_SOCK_ */
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)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index fc0a4e5895ee..aadd7cef73b3 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2184,12 +2184,17 @@ static int tcpv6_net_init(struct net *net)
static void tcpv6_net_exit(struct net *net)
{
inet_ctl_sock_destroy(net->ipv6.tcp_sk);
- inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET6);
+}
+
+static void tcpv6_net_exit_batch(struct list_head *net_exit_list)
+{
+ inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
}
static struct pernet_operations tcpv6_net_ops = {
- .init = tcpv6_net_init,
- .exit = tcpv6_net_exit,
+ .init = tcpv6_net_init,
+ .exit = tcpv6_net_exit,
+ .exit_batch = tcpv6_net_exit_batch,
};
int __init tcpv6_init(void)