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netlink: move nl_table in read_mostly section 

netlink sockets creation and deletion heavily modify nl_table_users
and nl_table_lock.

If nl_table is sharing one cache line with one of them, netlink
performance is really bad on SMP.

ffffffff81ff5f00 B nl_table
ffffffff81ff5f0c b nl_table_users

Putting nl_table in read_mostly section increased performance
of my open/delete netlink sockets test by about 80 %

This came up while diagnosing a getaddrinfo() problem.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-05-12 17:24:50 -07:00 committed by David S. Miller
parent be346ffaad
commit 91dd93f956
1 changed files with 1 additions and 1 deletions
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2
net/netlink/af_netlink.c
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@ -89,7 +89,7 @@ static inline int netlink_is_kernel(struct sock *sk)
return nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET;
}
struct netlink_table *nl_table;
struct netlink_table *nl_table __read_mostly;
EXPORT_SYMBOL_GPL(nl_table);
static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait);