Re: [PATCH 15/16] mm/migration: fix possible do_pages_stat_array racing with memory offline

[Muchun Song]

On Mon, Mar 7, 2022 at 1:22 PM Huang, Ying <ying.huang@xxxxxxxxx> wrote:
>
> Miaohe Lin <linmiaohe@xxxxxxxxxx> writes:
>
> > When follow_page peeks a page, the page could be reclaimed under heavy
> > memory pressure
>
> I don't think that memory pressure and reclaiming will be an issue.

I think he means a page first to be reclaimed then to be offline
could encounter this issue and reclaiming is a precondition.

Thanks.

>
> > and thus be offlined while it's still being used by the
> > do_pages_stat_array().
>
> "offline" seems a possible problem.