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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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3
net/ipv4/proc.c
View file

@ -55,7 +55,8 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
sock_prot_inuse_get(net, &tcp_prot),
atomic_read(&tcp_orphan_count),
tcp_death_row.tw_count, atomic_read(&tcp_sockets_allocated),
tcp_death_row.tw_count,
(int)percpu_counter_sum_positive(&tcp_sockets_allocated),
atomic_read(&tcp_memory_allocated));
seq_printf(seq, "UDP: inuse %d mem %d\n",
sock_prot_inuse_get(net, &udp_prot),

8
net/ipv4/tcp.c
View file

@ -290,9 +290,12 @@ EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
atomic_t tcp_memory_allocated; /* Current allocated memory. */
atomic_t tcp_sockets_allocated; /* Current number of TCP sockets. */
EXPORT_SYMBOL(tcp_memory_allocated);
/*
* Current number of TCP sockets.
*/
struct percpu_counter tcp_sockets_allocated;
EXPORT_SYMBOL(tcp_sockets_allocated);
/*
@ -2685,6 +2688,7 @@ void __init tcp_init(void)
BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb));
percpu_counter_init(&tcp_sockets_allocated, 0);
tcp_hashinfo.bind_bucket_cachep =
kmem_cache_create("tcp_bind_bucket",
sizeof(struct inet_bind_bucket), 0,

4
net/ipv4/tcp_ipv4.c
View file

@ -1797,7 +1797,7 @@ static int tcp_v4_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;
}
@ -1845,7 +1845,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
sk->sk_sndmsg_page = NULL;
}
atomic_dec(&tcp_sockets_allocated);
percpu_counter_dec(&tcp_sockets_allocated);
}
EXPORT_SYMBOL(tcp_v4_destroy_sock);