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

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Message-ID: <CANaxB-xuND3OoUqDrFQfN+xLwiWzY0SMRJ_RvF1+-emTuqNZkA@mail.gmail.com>
Date: Thu, 20 Mar 2025 08:00:36 -0700
From: Andrei Vagin <avagin@...il.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.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 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.

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.

Thanks,
Andrei