into a pg_data_t. The bootmem_data_t is just one part of this. To
make the code look uniform between NUMA and regular UMA platforms,
UMA platforms have a statically allocated pg_data_t too (contig_page_data).
-For the sake of uniformity, the variable "numnodes" is also defined
+For the sake of uniformity, the function num_online_nodes() is also defined
for all platforms. As we run benchmarks, we might decide to NUMAize
more variables like low_on_memory, nr_free_pages etc into the pg_data_t.