Re: [BUG REPORT] [mm-hotplug, aio] aio ring_pages can't be offlined

[Zach Brown]

> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/