Questions on pg_data_t structure

[Timur Tabi <ttabi@interactivesi.com>]

Ok, I've been trying to figure this stuff out over the past two weeks, and I
need help.

Here's what I think I know so far:

In a non-NUMA system, there is a single master pg_data_t structure called
contig_page_data.

contig_page_data contains two arrays, node_zonelists and node_zones.  There are
MAX_NR_ZONES (3) elements in node_zones, and there are 256 elements (of which
only the first 16 in non-CONFIG_HIGHMEM kernels are supposed to be used.)

Here's where I get confused:

node_zones is an array of zone_t structures.  node_zonelists is an array of
zonelist_t structures.  The zonelist_t structure also contains an array of
zone_t structures.  

My question is: what is the difference between the zone_t's in node_zones and
the zone_t's in each node_zonelists element?



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Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com

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