[NET]: move struct proto_ops to const
I noticed that some of 'struct proto_ops' used in the kernel may share
a cache line used by locks or other heavily modified data. (default
linker alignement is 32 bytes, and L1_CACHE_LINE is 64 or 128 at
least)
This patch makes sure a 'struct proto_ops' can be declared as const,
so that all cpus can share all parts of it without false sharing.
This is not mandatory : a driver can still use a read/write structure
if it needs to (and eventually a __read_mostly)
I made a global stubstitute to change all existing occurences to make
them const.
This should reduce the possibility of false sharing on SMP, and
speedup some socket system calls.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 3e24627..deda6fd 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -251,10 +251,10 @@
}
-static struct proto_ops packet_ops;
+static const struct proto_ops packet_ops;
#ifdef CONFIG_SOCK_PACKET
-static struct proto_ops packet_ops_spkt;
+static const struct proto_ops packet_ops_spkt;
static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
@@ -1784,7 +1784,7 @@
#ifdef CONFIG_SOCK_PACKET
-static struct proto_ops packet_ops_spkt = {
+static const struct proto_ops packet_ops_spkt = {
.family = PF_PACKET,
.owner = THIS_MODULE,
.release = packet_release,
@@ -1806,7 +1806,7 @@
};
#endif
-static struct proto_ops packet_ops = {
+static const struct proto_ops packet_ops = {
.family = PF_PACKET,
.owner = THIS_MODULE,
.release = packet_release,