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authorEric Dumazet <dada1@cosmosbay.com>2005-12-22 15:49:22 -0500
committerDavid S. Miller <davem@sunset.davemloft.net>2006-01-03 16:11:15 -0500
commit90ddc4f0470427df306f308ad03db6b6b21644b8 (patch)
treef97c1d57b25585394ebbd4b42b8d42a339f98644 /net/dccp/proto.c
parent77d76ea310b50a9c8ff15bd290fcb4ed4961adf2 (diff)
[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/dccp/proto.c')
-rw-r--r--net/dccp/proto.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 40a4c6899051..e4e629ed9bf7 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -680,7 +680,7 @@ void dccp_shutdown(struct sock *sk, int how)
680 680
681EXPORT_SYMBOL_GPL(dccp_shutdown); 681EXPORT_SYMBOL_GPL(dccp_shutdown);
682 682
683static struct proto_ops inet_dccp_ops = { 683static const struct proto_ops inet_dccp_ops = {
684 .family = PF_INET, 684 .family = PF_INET,
685 .owner = THIS_MODULE, 685 .owner = THIS_MODULE,
686 .release = inet_release, 686 .release = inet_release,