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| author |   Eric Dumazet <dada1@cosmosbay.com> | 2005-12-22 12:49:22 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2006-01-03 13:11:15 -0800 |
| commit | 90ddc4f0470427df306f308ad03db6b6b21644b8 (patch) | |
| tree | f97c1d57b25585394ebbd4b42b8d42a339f98644 /net/packet/af_packet.c | |
| parent | [NET]: Small cleanup to socket initialization (diff) | |
| download | linux-dev-90ddc4f0470427df306f308ad03db6b6b21644b8.tar.xz linux-dev-90ddc4f0470427df306f308ad03db6b6b21644b8.zip | |
[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>
Diffstat (limited to 'net/packet/af_packet.c')
| -rw-r--r-- | net/packet/af_packet.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 3e2462760413..deda6fdb1e53 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -251,10 +251,10 @@ static void packet_sock_destruct(struct sock *sk) } -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 @@ out: #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 @@ static struct proto_ops packet_ops_spkt = { }; #endif -static struct proto_ops packet_ops = { +static const struct proto_ops packet_ops = { .family = PF_PACKET, .owner = THIS_MODULE, .release = packet_release, |