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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/llc/af_llc.c | |
| parent | 77d76ea310b50a9c8ff15bd290fcb4ed4961adf2 (diff) | |
| download | lwn-90ddc4f0470427df306f308ad03db6b6b21644b8.tar.gz lwn-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/llc/af_llc.c')
| -rw-r--r-- | net/llc/af_llc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c index b6d3df5c911c..9cf65f9d8902 100644 --- a/net/llc/af_llc.c +++ b/net/llc/af_llc.c @@ -36,7 +36,7 @@ static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START; static u16 llc_ui_sap_link_no_max[256]; static struct sockaddr_llc llc_ui_addrnull; -static struct proto_ops llc_ui_ops; +static const struct proto_ops llc_ui_ops; static int llc_ui_wait_for_conn(struct sock *sk, long timeout); static int llc_ui_wait_for_disc(struct sock *sk, long timeout); @@ -1098,7 +1098,7 @@ static struct net_proto_family llc_ui_family_ops = { .owner = THIS_MODULE, }; -static struct proto_ops llc_ui_ops = { +static const struct proto_ops llc_ui_ops = { .family = PF_LLC, .owner = THIS_MODULE, .release = llc_ui_release, |