> Note that this would prevent ipv4 from being hacked into being
> modular, but there are no plans at all to make modular ipv4 for 2.6.x
> at all so this is a valid transformation/cleanup.
(if ipv4 was made modular) Just reserve the per-cpu statistics space in the
main kernel when CONFIG_IPV4_MODULE is set. Then you can use it from the module
as needed.
> kernel/timer.c's main data structures desperately want to be per-cpu
> or allocated at boot time also. It, as has been noted often on this
> list, is actually more bloat than the ipv4 statistics stuff. :-)
.. and many more data structures that are still cacheline padded too.
(my favourite is in balance_dirty_pages_ratelimit which costs 4K overall
for a single per cpu counter)
-Andi
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