Jonathan Morton wrote:

quoted

So the more users, the more slowly it ages.  You get the idea.

However big you make that scaling constant, you'll always find some pages
which have more users than that.

2^24?

BUT, as it turns out, refill_inactive_scan() already does ageing down on a
page-by-page basis, rather than process-by-process.

Yes.  page->count needs looking at if you're doing physically-addressed
scanning.  Rik's patch probably does that.
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