Going through the 4.4 BSD book, I learnt that the purpose of the pv_table
is to be able to locate all the mappings to a given physical page.
However, comparing this to the Linux approach, which chains vm_area_struct
(analogous to vm_map_entry in FreeBSD) together to locate the shared
mappings, it appears to me that the Linux approach is more space efficient.
So why not eliminate pv_table and chain vm_map_entries together to represent
the sharing information ?
-Arun
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