linux-kernel - Re: [PATCH 0/2] fs/proc: extend the PAGEMAP

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Message-ID: <6585818e-905f-4cba-b29d-a3e6390c66fa@lucifer.local>
Date: Fri, 21 Mar 2025 09:49:12 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrei Vagin <avagin@...il.com>
Cc: Andrei Vagin <avagin@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        David Hildenbrand <david@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>, criu@...ts.linux.dev,
        Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>,
        Pavel Tikhomirov <snorcht@...il.com>
Subject: Re: [PATCH 0/2] fs/proc: extend the PAGEMAP_SCAN ioctl to report

On Thu, Mar 20, 2025 at 08:00:36AM -0700, Andrei Vagin wrote:
> On Thu, Mar 20, 2025 at 4:04 AM Lorenzo Stoakes
> <lorenzo.stoakes@...cle.com> wrote:
> >
> > Well I guess it couldn't wait ;) we're (very!) late in the cycle and
> > immediately pre-LSF (will you be there btw?) so this is 6.16 for sure.
> >
> > Kinda wish you'd mentioned you wanted to do it as I'd rearranged my
> > schedule to tackle this as a priority post-LSF, but you've done a good job
> > so we're all good! Just a little heads up would have been nice ;)
> >
> > Some nits and you need to fix the test header thing but otherwise good.
>
> I wasn't rushing these changes. Just trying to help and save you some
> time:). We'd like to backport this to older releases, but that's a separate
> task. I'll submit backport requests to the stable branches and hope
> (fingers crossed) the maintainers approve them. Sorry I didn't let you know
> I could help with this.

Please don't submit any backport requests yet, let me handle that for
both. I mean I'm a maintainer of memory mapping bits, at least, so I
approve from my side :)

Andrew's input is necessary for rest, but let me handle that just so we
don't step on each other's toes here too much!

>
> Thanks for the review.
>
> P.S. I don't think I made the CRIU urgency clear enough earlier. We're not
> in panic mode, and we do have time to handle this. The lightweight guard
> regions are in glibc, but aren't in any distro releases yet. We found the
> problem when CRIU tests started failing on Fedora Rawhide. We probably have
> a few months before the new glibc hits official distros and becomes a real
> issue for CRIU users.

Good! I am eager to avoid any issues here. You'll find us in mm to be
responsive :)

>
> Thanks,
> Andrei

Cheers, Lorenzo