From: Pedro Falcato <pfalcato@suse.de>
To: Zi Yan <ziy@nvidia.com>
Cc: Gregg Leventhal <gleventhal@janestreet.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Song Liu <song@kernel.org>,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Eric Hagberg <ehagberg@janestreet.com>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>
Subject: Re: Subject: [BUG/RFC] write-open file THP cache purge can discard dirty page cache
Date: Wed, 1 Jul 2026 13:05:13 +0100 [thread overview]
Message-ID: <akUCbsNo2krhSV03@pedro-suse> (raw)
In-Reply-To: <DJMR0W6NUSAI.3UF6I74VFDFSH@nvidia.com>
On Tue, Jun 30, 2026 at 06:48:39PM -0400, Zi Yan wrote:
> On Tue Jun 30, 2026 at 3:55 PM EDT, Pedro Falcato wrote:
> > On Tue, Jun 30, 2026 at 07:49:12PM +0100, Pedro Falcato wrote:
> > snip
> >>
> >> Other idea: perhaps doing filemap_write_and_wait() after the nr_thps
> >> increment in collapse_file() will Just Work and result in a _much_
> >> simpler fix. And it avoids any weird forward-progress issues as no one can
> >> write to folios at that point.
> >>
> >
> > Gregg, if you could test this patch, it would be much appreciated. This patch
> > (hopefully) makes it so no dirty folio will ever coexist with a ro-THP, thus
> > hopefully sidestepping the entire issue in a simple way. Only compile-tested
> > and not reviewed.
>
> I tested the patch on v6.12 kernel with the reproducer from Gregg and
> confirmed that the issue is fixed.
>
> Feel free to add
> Tested-by: Zi Yan <ziy@nvidia.com>
Awesome, thanks!
--
Pedro
next prev parent reply other threads:[~2026-07-01 12:05 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-30 17:01 Subject: [BUG/RFC] write-open file THP cache purge can discard dirty page cache Gregg Leventhal
2026-06-30 17:18 ` Gregg Leventhal
2026-06-30 18:31 ` Pedro Falcato
2026-06-30 18:49 ` Pedro Falcato
2026-06-30 19:55 ` Pedro Falcato
2026-06-30 22:34 ` Matthew Wilcox
2026-06-30 22:48 ` Zi Yan
2026-07-01 12:05 ` Pedro Falcato [this message]
2026-07-01 11:54 ` Matthew Wilcox
2026-07-01 12:04 ` Pedro Falcato
2026-07-01 12:48 ` Pedro Falcato
2026-07-01 13:07 ` Gregg Leventhal
2026-07-01 14:23 ` Pedro Falcato
2026-06-30 18:36 ` Matthew Wilcox
2026-06-30 19:05 ` Zi Yan
2026-06-30 19:07 ` Matthew Wilcox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=akUCbsNo2krhSV03@pedro-suse \
--to=pfalcato@suse.de \
--cc=akpm@linux-foundation.org \
--cc=brauner@kernel.org \
--cc=david@kernel.org \
--cc=ehagberg@janestreet.com \
--cc=gleventhal@janestreet.com \
--cc=jack@suse.cz \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=ljs@kernel.org \
--cc=song@kernel.org \
--cc=viro@zeniv.linux.org.uk \
--cc=willy@infradead.org \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox