linux-kernel - Re: [PATCH] hugetlb: unshare some PMDs when splitting VMAs

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Message-ID: <CADrL8HXp3Ta9Cf=6yrmhT=WiEtPTeNrkyOdpoM-MLkNejTRWnA@mail.gmail.com>
Date:   Tue, 3 Jan 2023 20:27:34 +0000
From:   James Houghton <jthoughton@...gle.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Muchun Song <songmuchun@...edance.com>,
        Peter Xu <peterx@...hat.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hugetlb: unshare some PMDs when splitting VMAs

> I think I've come up with one... :) It only took many many hours of
> staring at code to come up with:
>
> 1. Fault in PUD_SIZE-aligned hugetlb mapping
> 2. fork() (to actually share the PMDs)

Erm, I mean: mmap(), then fork(), then fault in both processes.