Problem:

This is a contributed patch (bug#72811). The original contributor
states that, "Historically, the suggested way to run MySQL on NUMA
machines has been to run with "numactl --interleave=all" so that
things like the InnoDB buffer pool are spread across all NUMA
nodes." Currently InnoDB buffer pool is allocated without using
NUMA features.

Solution:

Provide an option (--innodb_numa_interleave) to allocate InnoDB buffer
pool using MPOL_INTERLEAVE memory policy of NUMA. What this patch does
is the following:

1.  If the option innodb_numa_interleave is enabled, then set the numa
    memory policy MPOL_INTERLEAVE for the mysqld process.
2.  Allocate the buffer pool.
3.  If the option innodb_numa_interleave is enabled, then set the numa
    memory policy back to MPOL_DEFAULT for the mysqld process.

So all allocations that happen between 1 and 3 will be using the
MPOL_INTERLEAVE memory policy.  This is a basic patch to make InnoDB
numa aware.  More fine grained control is possible and will be taken
up later.

rb#7309 approved by allen.