Re: [PATCH v2 7/7] mm, page_alloc: disable pcplists during memory offline

[Vlastimil Babka]

On 10/8/20 2:45 PM, Michal Hocko wrote:
> On Thu 08-10-20 13:42:01, Vlastimil Babka wrote:
> > Memory offline relies on page isolation can race with process freeing pages to
> > pcplists in a way that a page from isolated pageblock can end up on pcplist.
>
> "Memory offlining relies on page isolation to guarantee a forward
> progress because pages cannot be reused while they are isolated. But the
> page isolation itself doesn't prevent from races while freed pages are
> stored on pcp lists and thus can be reused.
> "

Much better, thanks.