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udp: inuse checks can quit early for reuseport

Browse source 
UDP lib inuse checks will walk the entire hash bucket to check if the
portaddr is in use. In the case of reuseport we can stop searching when
we find a matching reuseport.

On a 16-core VM a test program that spawns 16 threads that each bind to
1024 sockets (one per 10ms) takes 1m45s. With this change it takes 11s.

Also add a cond_resched() when the port is not specified.

Signed-off-by: Eric Garver <e@erig.me>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Garver 2017-01-05 20:22:36 -05:00 committed by David S. Miller
parent 89eb9835b2
commit df560056d9
1 changed files with 19 additions and 10 deletions
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29
net/ipv4/udp.c
View file

@ -153,13 +153,18 @@ static int udp_lib_lport_inuse(struct net *net, __u16 num,
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
(!sk2->sk_reuseport || !sk->sk_reuseport ||
rcu_access_pointer(sk->sk_reuseport_cb) ||
!uid_eq(uid, sock_i_uid(sk2))) &&
saddr_comp(sk, sk2, true)) {
if (!bitmap)
return 1;
__set_bit(udp_sk(sk2)->udp_port_hash >> log, bitmap);
if (sk2->sk_reuseport && sk->sk_reuseport &&
!rcu_access_pointer(sk->sk_reuseport_cb) &&
uid_eq(uid, sock_i_uid(sk2))) {
if (!bitmap)
return 0;
} else {
if (!bitmap)
return 1;
__set_bit(udp_sk(sk2)->udp_port_hash >> log,
bitmap);
}
}
}
return 0;
@ -188,11 +193,14 @@ static int udp_lib_lport_inuse2(struct net *net, __u16 num,
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
(!sk2->sk_reuseport || !sk->sk_reuseport ||
rcu_access_pointer(sk->sk_reuseport_cb) ||
!uid_eq(uid, sock_i_uid(sk2))) &&
saddr_comp(sk, sk2, true)) {
res = 1;
if (sk2->sk_reuseport && sk->sk_reuseport &&
!rcu_access_pointer(sk->sk_reuseport_cb) &&
uid_eq(uid, sock_i_uid(sk2))) {
res = 0;
} else {
res = 1;
}
break;
}
}
@ -285,6 +293,7 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum,
snum += rand;
} while (snum != first);
spin_unlock_bh(&hslot->lock);
cond_resched();
} while (++first != last);
goto fail;
} else {