linux-kernel - Re: [PATCH v8 22/23] mm: Enable PTE markers by default

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Message-ID: <YmAX4IGu128Kinte@xz-m1.local>
Date:   Wed, 20 Apr 2022 10:25:36 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Alistair Popple <apopple@...dia.com>
Subject: Re: [PATCH v8 22/23] mm: Enable PTE markers by default

On Wed, Apr 20, 2022 at 09:46:07AM -0400, Johannes Weiner wrote:
> My point was simply that for the user it might be easiest and most
> intuitive if userfaultfd and its related suboptions are 1) grouped
> together and 2) in the MM submenu.

Very reasonable request.

> Yeah it looks like there is a healthy mix ;) To add to the list:
> 
> - mm/Kconfig has CONFIG_SWAP for the swapon/swapoff syscalls.
> - fs/Kconfig has CONFIG_FILE_LOCKING, which adds the flock() syscall.
> - Interestingly, fs/Kconfig has CONFIG_MEMFD_CREATE for memfd_create()
>   which is implemented in mm/memfd.c.
> 
> It seems reasonable to me to move the userfaultfd stuff to mm as well,
> especially when it's becoming more than just a single binary question
> on whether you want a syscall or not, and has MM-specific suboptions.

Thanks for the extra information!

Obviously as you said it's growing a little bit.  I'll give it a shot later
today.

-- 
Peter Xu