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SubjectRe: [BUG REPORT] [mm-hotplug, aio] aio ring_pages can't be offlined
> The best I can think of is to make changes in or around
> get_user_pages(), to steal the pages from userspace and replace them
> with non-movable ones before pinning them. The performance cost of
> something like this would surely be unacceptable for direct-io, but
> maybe OK for the aio ring and futexes.

In the aio case it seems like it could be taught to populate the mapping
with non-movable pages to begin with. It's calling get_user_pages() a
few lines after instantiating the mapping itself with do_mmap_pgoff().

- z

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