Messages in this thread | | | From | "Huang, Ying" <> | Subject | Re: [PATCH 15/16] mm/migration: fix possible do_pages_stat_array racing with memory offline | Date | Mon, 07 Mar 2022 15:42:43 +0800 |
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Muchun Song <songmuchun@bytedance.com> writes:
> On Mon, Mar 7, 2022 at 1:22 PM Huang, Ying <ying.huang@intel.com> wrote: >> >> Miaohe Lin <linmiaohe@huawei.com> 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.
I don't think reclaiming is a precondition. It seems possible that the virtual page is migrated, then the physical page is offlined.
Best Regards, Huang, Ying
> Thanks. > >> >> > and thus be offlined while it's still being used by the >> > do_pages_stat_array(). >> >> "offline" seems a possible problem.
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