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SubjectRe: [PATCH v2 00/28] The new cgroup slab memory controller
> I am on an old codebase that already has the fix that you are proposing,
> so I might be seeing someother issue which I will debug further.
>
> So looks like the loop in __offline_pages() had a call to
> drain_all_pages() before it was removed by
>
> c52e75935f8d: mm: remove extra drain pages on pcp list

I see, thanks. There is a reason to have the second drain, my fix is a
little better as it is performed only on a rare occasion when it is
needed, but I should add a FIXES tag. I have not checked
alloc_contig_range race.

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