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SubjectRe: [PATCH] mm, hugetlb, soft_offline: save compound page order before page migration
On Tue, Sep 12, 2017 at 01:54:48PM -0700, Andrew Morton wrote:
> On Tue, 12 Sep 2017 22:43:06 +0200 Alexandru Moise <00moses.alexander00@gmail.com> wrote:
>
> > This fixes a bug in madvise() where if you'd try to soft offline a
> > hugepage via madvise(), while walking the address range you'd end up,
> > using the wrong page offset due to attempting to get the compound
> > order of a former but presently not compound page, due to dissolving
> > the huge page (since c3114a8).
>
> What are the user visible effects of the bug? The wrong page is
> offlined? No offlining occurs?

I end up with all my free pages getting offlined. Except 1.

../Alex

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