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author | Pavel Emelyanov <xemul@openvz.org> | 2008-03-28 16:38:43 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2008-03-28 16:38:43 -0700 |
commit | 1338d466d9c3f8a65cc6d83c629cd906f2a989f8 (patch) | |
tree | 2f30913c1c9c6d3c0616ac593e79b0431cc150d3 /net/dccp | |
parent | 13ff3d6fa4e6d8b6ee7c64245a0078e6a0e6f977 (diff) | |
download | op-kernel-dev-1338d466d9c3f8a65cc6d83c629cd906f2a989f8.zip op-kernel-dev-1338d466d9c3f8a65cc6d83c629cd906f2a989f8.tar.gz |
[SOCK]: Introduce a percpu inuse counters array (v2).
And redirect sock_prot_inuse_add and _get to use one.
As far as the dereferences are concerned. Before the patch we made
1 dereference to proto->inuse.add call, the call itself and then
called the __get_cpu_var() on a static variable. After the patch we
make a direct call, then one dereference to proto->inuse_idx and
then the same __get_cpu_var() on a still static variable. So this
patch doesn't seem to produce performance penalty on SMP.
This is not per-net yet, but I will deliberately make NET_NS=y case
separated from NET_NS=n one, since it'll cost us one-or-two more
dereferences to get the struct net and the inuse counter.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp')
0 files changed, 0 insertions, 0 deletions