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authorEric Dumazet <dada1@cosmosbay.com>2005-12-22 23:49:22 +0300
committerDavid S. Miller <davem@sunset.davemloft.net>2006-01-04 00:11:15 +0300
commit90ddc4f0470427df306f308ad03db6b6b21644b8 (patch)
treef97c1d57b25585394ebbd4b42b8d42a339f98644 /include/net/protocol.h
parent77d76ea310b50a9c8ff15bd290fcb4ed4961adf2 (diff)
downloadlinux-90ddc4f0470427df306f308ad03db6b6b21644b8.tar.xz
[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 'include/net/protocol.h')
-rw-r--r--include/net/protocol.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/protocol.h b/include/net/protocol.h
index a29cb29647d0..63f7db99c2a6 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -65,7 +65,7 @@ struct inet_protosw {
int protocol; /* This is the L4 protocol number. */
struct proto *prot;
- struct proto_ops *ops;
+ const struct proto_ops *ops;
int capability; /* Which (if any) capability do
* we need to use this socket