From: Miklos Szeredi <miklos@szeredi.hu>
To: Joanne Koong <joannelkoong@gmail.com>
Cc: Bernd Schubert <bernd.schubert@fastmail.fm>,
Jeff Layton <jlayton@kernel.org>,
David Hildenbrand <david@redhat.com>,
Shakeel Butt <shakeel.butt@linux.dev>, Zi Yan <ziy@nvidia.com>,
linux-fsdevel@vger.kernel.org, jefflexu@linux.alibaba.com,
josef@toxicpanda.com, linux-mm@kvack.org, kernel-team@meta.com,
Matthew Wilcox <willy@infradead.org>,
Oscar Salvador <osalvador@suse.de>,
Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH v6 4/5] mm/migrate: skip migrating folios under writeback with AS_WRITEBACK_INDETERMINATE mappings
Date: Tue, 14 Jan 2025 21:00:55 +0100 [thread overview]
Message-ID: <CAJfpeguRGgfNnnDWxtQ4L1vuOA+fPe0KLtMLaUCiDeHdpq0CKg@mail.gmail.com> (raw)
In-Reply-To: <CAJnrk1Y14Xn8y2GLhGeVaistpX3ncTpkzSNBhDvN37v7YGSo4g@mail.gmail.com>
On Tue, 14 Jan 2025 at 20:12, Joanne Koong <joannelkoong@gmail.com> wrote:
> If we copy the cache page, do we not have the same issue with needing
> an rb tree to track writeback state since writeback on the original
> folio would be immediately cleared?
Writeback would not be cleared in that case. The copy would be to
guarantee that the page can be migrated. Starting migration for an
under-writeback page would need some new mechanism, because currently
that's not possible.
But I realize now that even though write-through does not involve
PG_writeback, doing splice will result in those cache pages being
referenced for an indefinite amount of time, which can deny migration.
Ugh. Same as page reading, this exists today.
Thanks,
Miklos
next prev parent reply other threads:[~2025-01-14 20:01 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-22 23:23 [PATCH v6 0/5] fuse: remove temp page copies in writeback Joanne Koong
2024-11-22 23:23 ` [PATCH v6 1/5] mm: add AS_WRITEBACK_INDETERMINATE mapping flag Joanne Koong
2024-11-22 23:23 ` [PATCH v6 2/5] mm: skip reclaiming folios in legacy memcg writeback indeterminate contexts Joanne Koong
2024-11-22 23:23 ` [PATCH v6 3/5] fs/writeback: in wait_sb_inodes(), skip wait for AS_WRITEBACK_INDETERMINATE mappings Joanne Koong
2024-11-22 23:23 ` [PATCH v6 4/5] mm/migrate: skip migrating folios under writeback with " Joanne Koong
2024-12-19 13:05 ` David Hildenbrand
2024-12-19 14:19 ` Zi Yan
2024-12-19 15:08 ` Zi Yan
2024-12-19 15:39 ` David Hildenbrand
2024-12-19 15:47 ` Zi Yan
2024-12-19 15:50 ` David Hildenbrand
2024-12-19 15:43 ` Shakeel Butt
2024-12-19 15:47 ` David Hildenbrand
2024-12-19 15:53 ` Shakeel Butt
2024-12-19 15:55 ` Zi Yan
2024-12-19 15:56 ` Bernd Schubert
2024-12-19 16:00 ` Zi Yan
2024-12-19 16:02 ` Zi Yan
2024-12-19 16:09 ` Bernd Schubert
2024-12-19 16:14 ` Zi Yan
2024-12-19 16:26 ` Shakeel Butt
2024-12-19 16:31 ` David Hildenbrand
2024-12-19 16:53 ` Shakeel Butt
2024-12-19 16:22 ` Shakeel Butt
2024-12-19 16:29 ` David Hildenbrand
2024-12-19 16:40 ` Shakeel Butt
2024-12-19 16:41 ` David Hildenbrand
2024-12-19 17:14 ` Shakeel Butt
2024-12-19 17:26 ` David Hildenbrand
2024-12-19 17:30 ` Bernd Schubert
2024-12-19 17:37 ` Shakeel Butt
2024-12-19 17:40 ` Bernd Schubert
2024-12-19 17:44 ` Joanne Koong
2024-12-19 17:54 ` Shakeel Butt
2024-12-20 11:44 ` David Hildenbrand
2024-12-20 12:15 ` Bernd Schubert
2024-12-20 14:49 ` David Hildenbrand
2024-12-20 15:26 ` Bernd Schubert
2024-12-20 18:01 ` Shakeel Butt
2024-12-21 2:28 ` Jingbo Xu
2024-12-21 16:23 ` David Hildenbrand
2024-12-22 2:47 ` Jingbo Xu
2024-12-24 11:32 ` David Hildenbrand
2024-12-21 16:18 ` David Hildenbrand
2024-12-23 22:14 ` Shakeel Butt
2024-12-24 12:37 ` David Hildenbrand
2024-12-26 15:11 ` Zi Yan
2024-12-26 20:13 ` Shakeel Butt
2024-12-26 22:02 ` Bernd Schubert
2024-12-27 20:08 ` Joanne Koong
2024-12-27 20:32 ` Bernd Schubert
2024-12-30 17:52 ` Joanne Koong
2024-12-30 10:16 ` David Hildenbrand
2024-12-30 18:38 ` Joanne Koong
2024-12-30 19:52 ` David Hildenbrand
2024-12-30 20:11 ` Shakeel Butt
2025-01-02 18:54 ` Joanne Koong
2025-01-03 20:31 ` David Hildenbrand
2025-01-06 10:19 ` Miklos Szeredi
2025-01-06 18:17 ` Shakeel Butt
2025-01-07 8:34 ` David Hildenbrand
2025-01-07 18:07 ` Shakeel Butt
2025-01-09 11:22 ` David Hildenbrand
2025-01-10 20:28 ` Jeff Layton
2025-01-10 21:13 ` David Hildenbrand
2025-01-10 22:00 ` Shakeel Butt
2025-01-13 15:27 ` David Hildenbrand
2025-01-13 21:44 ` Jeff Layton
2025-01-14 8:38 ` Miklos Szeredi
2025-01-14 9:40 ` Miklos Szeredi
2025-01-14 9:55 ` Bernd Schubert
2025-01-14 10:07 ` Miklos Szeredi
2025-01-14 18:07 ` Joanne Koong
2025-01-14 18:58 ` Miklos Szeredi
2025-01-14 19:12 ` Joanne Koong
2025-01-14 20:00 ` Miklos Szeredi [this message]
2025-01-14 20:29 ` Jeff Layton
2025-01-14 21:40 ` Bernd Schubert
2025-01-23 16:06 ` Pavel Begunkov
2025-01-14 20:51 ` Joanne Koong
2025-01-24 12:25 ` David Hildenbrand
2025-01-14 15:49 ` Jeff Layton
2025-01-24 12:29 ` David Hildenbrand
2025-01-28 10:16 ` Miklos Szeredi
2025-01-14 15:44 ` Jeff Layton
2025-01-14 18:58 ` Joanne Koong
2025-01-10 23:11 ` Jeff Layton
2025-01-10 20:16 ` Jeff Layton
2025-01-10 20:20 ` David Hildenbrand
2025-01-10 20:43 ` Jeff Layton
2025-01-10 21:00 ` David Hildenbrand
2025-01-10 21:07 ` Jeff Layton
2025-01-10 21:21 ` David Hildenbrand
2025-01-07 16:15 ` Miklos Szeredi
2025-01-08 1:40 ` Jingbo Xu
2024-12-30 20:04 ` Shakeel Butt
2025-01-02 19:59 ` Joanne Koong
2025-01-02 20:26 ` Zi Yan
2024-12-20 21:01 ` Joanne Koong
2024-12-21 16:25 ` David Hildenbrand
2024-12-21 21:59 ` Bernd Schubert
2024-12-23 19:00 ` Joanne Koong
2024-12-26 22:44 ` Bernd Schubert
2024-12-27 18:25 ` Joanne Koong
2024-12-19 17:55 ` Joanne Koong
2024-12-19 18:04 ` Bernd Schubert
2024-12-19 18:11 ` Shakeel Butt
2024-12-20 7:55 ` Jingbo Xu
2025-04-02 21:34 ` Joanne Koong
2025-04-03 3:31 ` Jingbo Xu
2025-04-03 9:18 ` David Hildenbrand
2025-04-03 9:25 ` Bernd Schubert
2025-04-03 9:35 ` Christian Brauner
2025-04-03 19:09 ` Joanne Koong
2025-04-03 20:44 ` David Hildenbrand
2025-04-03 22:04 ` Joanne Koong
2024-11-22 23:23 ` [PATCH v6 5/5] fuse: remove tmp folio for writebacks and internal rb tree Joanne Koong
2024-11-25 9:46 ` Jingbo Xu
2024-12-12 21:55 ` [PATCH v6 0/5] fuse: remove temp page copies in writeback Joanne Koong
2024-12-13 11:52 ` Miklos Szeredi
2024-12-13 16:47 ` Shakeel Butt
2024-12-18 17:37 ` Joanne Koong
2024-12-18 17:44 ` Shakeel Butt
2024-12-18 17:53 ` Joanne Koong
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=CAJfpeguRGgfNnnDWxtQ4L1vuOA+fPe0KLtMLaUCiDeHdpq0CKg@mail.gmail.com \
--to=miklos@szeredi.hu \
--cc=bernd.schubert@fastmail.fm \
--cc=david@redhat.com \
--cc=jefflexu@linux.alibaba.com \
--cc=jlayton@kernel.org \
--cc=joannelkoong@gmail.com \
--cc=josef@toxicpanda.com \
--cc=kernel-team@meta.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=osalvador@suse.de \
--cc=shakeel.butt@linux.dev \
--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