net: Use a percpu_counter for orphan_count

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 05af807ca9b9..1ccdbba528be 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -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);