on the topic of LRU lists

[Rik van Riel <H.H.vanRiel@phys.uu.nl>]

Hi Stephen,

now that I think of multiple lists, it might be nice to
have a 2-level LRU scheme for each type of allocation:
- user pages
- shared stuff
- buffers
- page cache

Then we do a sort of round-robin allocation and memory
pressure will make sure that the amount of memory is
automatically balanced between the different uses.

(just a stupid idea)

Rik.
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