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SubjectRe: The IBM order relaxation patch
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> >with a GPF flag? What they describe does not happen in an
> >interrupt context, so we can sleep.
>
> Because nobody even *tries* to free adjacent pages to build up
> a free order-2 area. You could wait really long ...

Without the rmap patch you can't easily do it

> rmap method could help here, because with reverse mappings we
> can at least try to free adjacent areas (because we then at least
> *know* who's using the pages).

rmap definitely makes it a real no brainer to do this at least for small
clusters of pages. Doing large chunks gets progressively harder
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