This is something I considered doing. It has various advantages, and it's
almost done already in a sense: the swap cache thing is what would act as
the buffer between the two passes.
Then the page table scanning would never really page anything out: it
would just move things into the swap cache. That makes the table scanner
simpler, actually. The real page-out would be when the swap-cache is
flushed to disk and then freed.
I'd like to see this, although I think it's way too late for 2.2
Linus
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