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net: Use a percpu_counter for orphan_count

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

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2008-11-25 21:17:14 -08:00
committed by David S. Miller
parent 1748376b66
commit dd24c00191
8 changed files with 24 additions and 18 deletions
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4
net/ipv4/inet_connection_sock.c
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@@ -561,7 +561,7 @@ void inet_csk_destroy_sock(struct sock *sk)
sk_refcnt_debug_release(sk);
atomic_dec(sk->sk_prot->orphan_count);
percpu_counter_dec(sk->sk_prot->orphan_count);
sock_put(sk);
}
@@ -641,7 +641,7 @@ void inet_csk_listen_stop(struct sock *sk)
sock_orphan(child);
atomic_inc(sk->sk_prot->orphan_count);
percpu_counter_inc(sk->sk_prot->orphan_count);
inet_csk_destroy_sock(child);