Denis V. Lunev wrote:
Recently David Miller and Herbert Xu pointed out that struct net becomes
overbloated and un-maintainable. There are two solutions:
- provide a pointer to a network subsystem definition from struct net.
This costs an additional dereferrence
- place sub-system definition into the structure itself. This will speedup
run-time access at the cost of recompilation time
The second approach looks better for us.
Yes, we do not need/want a pointer in this structure and add more
dereference in the network code.
Other sub-systems will be converted
to this approach if this will be accepted :)
Signed-off-by: Denis V. Lunev <den@xxxxxxxxxx>
---
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index b62e31f..f60e1ce 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -8,6 +8,8 @@
#include <linux/workqueue.h>
#include <linux/list.h>
+#include <net/netns/unix.h>
+
struct proc_dir_entry;
struct net_device;
struct sock;
@@ -46,8 +48,7 @@ struct net {
struct hlist_head packet_sklist;
/* unix sockets */
- int sysctl_unix_max_dgram_qlen;
- struct ctl_table_header *unix_ctl;
+ struct netns_unix unx;
Can you change this from unx to unix ?
If you encapsulate the structure definitions per subsystem, you can drop
the unix prefix in the variable declaration.
Instead of having:
netns->unix->unix_ctl
you will have:
netns->unix->ctl
};
#ifdef CONFIG_NET
diff --git a/include/net/netns/unix.h b/include/net/netns/unix.h
new file mode 100644
index 0000000..27b4e7f
--- /dev/null
+++ b/include/net/netns/unix.h
@@ -0,0 +1,13 @@
+/*
+ * Unix network namespace
+ */
+#ifndef __NETNS_UNIX_H__
+#define __NETNS_UNIX_H__
+
+struct ctl_table_header;
+struct netns_unix {
+ int sysctl_unix_max_dgram_qlen;
+ struct ctl_table_header *unix_ctl;
+};
+
+#endif /* __NETNS_UNIX_H__ */
If I follow the logic, we will have a file per subsystem. These files
will be very small, no ?
IMHO, having the structure defined in net_namespace.h is enough.
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index b8a2189..06f7ec8 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -592,7 +592,7 @@ static struct sock * unix_create1(struct net *net, struct socket *sock)
&af_unix_sk_receive_queue_lock_key);
sk->sk_write_space = unix_write_space;
- sk->sk_max_ack_backlog = net->sysctl_unix_max_dgram_qlen;
+ sk->sk_max_ack_backlog = net->unx.sysctl_unix_max_dgram_qlen;
sk->sk_destruct = unix_sock_destructor;
u = unix_sk(sk);
u->dentry = NULL;
@@ -2138,7 +2138,7 @@ static int unix_net_init(struct net *net)
{
int error = -ENOMEM;
- net->sysctl_unix_max_dgram_qlen = 10;
+ net->unx.sysctl_unix_max_dgram_qlen = 10;
if (unix_sysctl_register(net))
goto out;
diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
index 553ef6a..fbddfb5 100644
--- a/net/unix/sysctl_net_unix.c
+++ b/net/unix/sysctl_net_unix.c
@@ -18,7 +18,7 @@ static ctl_table unix_table[] = {
{
.ctl_name = NET_UNIX_MAX_DGRAM_QLEN,
.procname = "max_dgram_qlen",
- .data = &init_net.sysctl_unix_max_dgram_qlen,
+ .data = &init_net.unx.sysctl_unix_max_dgram_qlen,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
@@ -40,9 +40,9 @@ int unix_sysctl_register(struct net *net)
if (table == NULL)
goto err_alloc;
- table[0].data = &net->sysctl_unix_max_dgram_qlen;
- net->unix_ctl = register_net_sysctl_table(net, unix_path, table);
- if (net->unix_ctl == NULL)
+ table[0].data = &net->unx.sysctl_unix_max_dgram_qlen;
+ net->unx.unix_ctl = register_net_sysctl_table(net, unix_path, table);
+ if (net->unx.unix_ctl == NULL)
goto err_reg;
return 0;
@@ -57,8 +57,8 @@ void unix_sysctl_unregister(struct net *net)
{
struct ctl_table *table;
- table = net->unix_ctl->ctl_table_arg;
- unregister_sysctl_table(net->unix_ctl);
+ table = net->unx.unix_ctl->ctl_table_arg;
+ unregister_sysctl_table(net->unx.unix_ctl);
kfree(table);
}
--
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