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net: Use a percpu_counter for sockets_allocated

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Instead of using one atomic_t per protocol, use a percpu_counter
for "sockets_allocated", to reduce cache line contention on
heavy duty network servers. 

Note : We revert commit (248969ae31
net: af_unix can make unix_nr_socks visbile in /proc),
since it is not anymore used after sock_prot_inuse_add() addition

Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2008-11-25 21:16:35 -08:00 • committed by David S. Miller
commit 1748376b66
11 changed files with 29 additions and 16 deletions
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2
net/ipv6/tcp_ipv6.c
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@ -1830,7 +1830,7 @@ static int tcp_v6_init_sock(struct sock *sk)
sk->sk_sndbuf = sysctl_tcp_wmem[1];
sk->sk_rcvbuf = sysctl_tcp_rmem[1];
atomic_inc(&tcp_sockets_allocated);
percpu_counter_inc(&tcp_sockets_allocated);
return 0;
}