commit 91b6d325635617540b6a1646ddb138bb17cbd569
author Eric Dumazet <edumazet@google.com> Mon Nov 15 11:02:39 2021 -0800
committer David S. Miller <davem@davemloft.net> Tue Nov 16 13:10:34 2021 +0000
tree f4bb42d5c9f0ae67c51618aaf2364feb014516d9
parent 6c302e799a0d4be1362f505453b714fe05d91f2a

net: cache align tcp_memory_allocated, tcp_sockets_allocated

tcp_memory_allocated and tcp_sockets_allocated often share
a common cache line, source of false sharing.

Also take care of udp_memory_allocated and mptcp_sockets_allocated.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mptcp/protocol.c

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index b7e32e3..6db93da 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -48,7 +48,7 @@ enum {
 	MPTCP_CMSG_TS = BIT(0),
 };
 
-static struct percpu_counter mptcp_sockets_allocated;
+static struct percpu_counter mptcp_sockets_allocated ____cacheline_aligned_in_smp;
 
 static void __mptcp_destroy_sock(struct sock *sk);
 static void __mptcp_check_send_data_fin(struct sock *sk);