linux-kernel - Re: [PATCH v4 0/4] hugetlb: Disable huge pmd unshare for uffd-wp

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Message-ID: <20210301142049.GB397383@xz-x1>
Date:   Mon, 1 Mar 2021 09:20:49 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH v4 0/4] hugetlb: Disable huge pmd unshare for uffd-wp

On Thu, Feb 18, 2021 at 06:06:29PM -0500, Peter Xu wrote:
> v4:
> - fix build for sparc by removing extra line in patch 1 [Mike]
> - pick Mike's r-b for patch 4
> 
> v3:
> - patch 4:
>   - fix build failure for !CMA and/or !HUGETLBFS [Axel]
>   - Fix mmu notifier range to use start/end [Mike]
> - add more r-bs
> 
> v2:
> - patch 4: move hugetlb_unshare_all_pmds() into mm/hugetlb.c, so it can be used
>   even outside userfaultfd.c
> 
> This series tries to disable huge pmd unshare of hugetlbfs backed memory for
> uffd-wp.  Although uffd-wp of hugetlbfs is still during rfc stage, the idea of
> this series may be needed for multiple tasks (Axel's uffd minor fault series,
> and Mike's soft dirty series), so I picked it out from the larger series.
> 
> References works:
> 
> Uffd shmem+hugetlbfs rfc:
> https://lore.kernel.org/lkml/20210115170907.24498-1-peterx@redhat.com/
> 
> Uffd minor mode for hugetlbfs:
> https://lore.kernel.org/lkml/20210212215403.3457686-1-axelrasmussen@google.com/
> 
> Soft dirty for hugetlbfs:
> https://lore.kernel.org/lkml/20210211000322.159437-1-mike.kravetz@oracle.com/

Andrew/Mike,

Do you have any further comment on this series?

Thanks,

-- 
Peter Xu