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, 1 insertions, 1 deletions

diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 4944b47ad628..614958b7c276 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -54,7 +54,7 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
         socket_seq_show(seq);
         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),
+                   (int)percpu_counter_sum_positive(&tcp_orphan_count),
                    tcp_death_row.tw_count,
                    (int)percpu_counter_sum_positive(&tcp_sockets_allocated),
                    atomic_read(&tcp_memory_allocated));