net: merge net->core.prot_inuse and net->core.sock_inuse

net->core.sock_inuse is a per cpu variable (int),
while net->core.prot_inuse is another per cpu variable
of 64 integers.

per cpu allocator tend to place them in very different places.

Grouping them together makes sense, since it makes
updates potentially faster, if hitting the same
cache line.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/netns/core.h

@@ -12,7 +12,6 @@ struct netns_core {
 	int	sysctl_somaxconn;
 
 #ifdef CONFIG_PROC_FS
-	int __percpu *sock_inuse;
 	struct prot_inuse __percpu *prot_inuse;
 #endif
 };

include/net/sock.h

@@ -1431,6 +1431,7 @@ proto_memory_pressure(struct proto *prot)
 #ifdef CONFIG_PROC_FS
 #define PROTO_INUSE_NR	64	/* should be enough for the first time */
 struct prot_inuse {
+	int all;
 	int val[PROTO_INUSE_NR];
 };
 /* Called with local bh disabled */
@@ -1442,7 +1443,7 @@ static inline void sock_prot_inuse_add(const struct net *net,
 
 static inline void sock_inuse_add(const struct net *net, int val)
 {
-	this_cpu_add(*net->core.sock_inuse, val);
+	this_cpu_add(net->core.prot_inuse->all, val);
 }
 
 int sock_prot_inuse_get(struct net *net, struct proto *proto);

net/core/sock.c

@@ -3553,7 +3553,7 @@ int sock_inuse_get(struct net *net)
 	int cpu, res = 0;
 
 	for_each_possible_cpu(cpu)
-		res += *per_cpu_ptr(net->core.sock_inuse, cpu);
+		res += per_cpu_ptr(net->core.prot_inuse, cpu)->all;
 
 	return res;
 }
@@ -3565,22 +3565,12 @@ static int __net_init sock_inuse_init_net(struct net *net)
 	net->core.prot_inuse = alloc_percpu(struct prot_inuse);
 	if (net->core.prot_inuse == NULL)
 		return -ENOMEM;
-
-	net->core.sock_inuse = alloc_percpu(int);
-	if (net->core.sock_inuse == NULL)
-		goto out;
-
 	return 0;
-
-out:
-	free_percpu(net->core.prot_inuse);
-	return -ENOMEM;
 }
 
 static void __net_exit sock_inuse_exit_net(struct net *net)
 {
 	free_percpu(net->core.prot_inuse);
-	free_percpu(net->core.sock_inuse);
 }
 
 static struct pernet_operations net_inuse_ops = {