[patch 0/4] net: Percpufy frequently used variables on struct proto

The following patches change struct proto.memory_allocated,
proto.sockets_allocated to use per-cpu counters. This patchset also switches
the proto.inuse percpu varible to use alloc_percpu, instead of NR_CPUS *
cacheline size padding.

We saw 5 % improvement in apache bench requests per second with this
patchset, on a multi nic 8 way 3.3 GHZ IBM x460 Xeon server.  

Patches follow.

Thanks,
Kiran
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Follow-Ups:
- [patch 4/4] net: Percpufy frequently used variables -- proto.inuse
  - From: Ravikiran G Thirumalai <[email protected]>
- [patch 3/4] net: Percpufy frequently used variables -- proto.sockets_allocated
  - From: Ravikiran G Thirumalai <[email protected]>
- [patch 2/4] net: Percpufy frequently used variables -- struct proto.memory_allocated
  - From: Ravikiran G Thirumalai <[email protected]>
- [patch 1/4] net: Percpufy frequently used variables -- add percpu_counter_mod_bh
  - From: Ravikiran G Thirumalai <[email protected]>

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