linux-kernel - Re: [PATCH RFC 00/30] userfaultfd-wp: Support shmem and hugetlbfs

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Date:   Fri, 5 Feb 2021 14:21:47 -0800 (PST)
From:   Hugh Dickins <hughd@...gle.com>
To:     Peter Xu <peterx@...hat.com>
cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Hugh Dickins <hughd@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH RFC 00/30] userfaultfd-wp: Support shmem and hugetlbfs

On Fri, 29 Jan 2021, Peter Xu wrote:
> 
> Huge & Mike,
> 
> Would any of you have comment/concerns on the high-level design of this series?
> 
> It would be great to know it, especially major objection, before move on to an
> non-rfc version.

Seeing Mike's update prompts me to speak up: I have been looking, and
will continue to look through it - will report when done; but find I've
been making very little forward progress from one day to the next.

It is very confusing, inevitably; but you have done an *outstanding*
job on acknowledging the confusion, and commenting it in great detail.

Hugh