Re: shrink_mmap() change in ac-21

Simple mathematics: On a 128MB machine, DMA zone is 16MB, thus NORMAL
zone is 112MB. 112/16 = 7. So statistically, for every DMA page freed,
we free another SEVEN! pages from the NORMAL zone. And we won't stop
doing such a genocide until DMA zone recovers.

I'm also concerned about 1GB boxes:
the highmem zone only contains ~ 64 MB (or 128?), and so most allocations go
into a tiny zone and are then "downgraded" to GFP_NORMAL.

Perhaps we should switch to per-zone lru lists?

--
    Manfred

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