linux-kernel - Re: [PATCH v3] writeback, cgroup: switch inodes with dirty timestamps to release dying cgwbs

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Message-Id: <20231018-dinkelbrot-botanik-b119bb8f4989@brauner>
Date:   Wed, 18 Oct 2023 11:07:20 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Jingbo Xu <jefflexu@...ux.alibaba.com>
Cc:     Christian Brauner <brauner@...nel.org>, lizefan.x@...edance.com,
        hannes@...xchg.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        viro@...iv.linux.org.uk, willy@...radead.org,
        joseph.qi@...ux.alibaba.com, tj@...nel.org, jack@...e.cz,
        Roman Gushchin <roman.gushchin@...ux.dev>
Subject: Re: [PATCH v3] writeback, cgroup: switch inodes with dirty timestamps to release dying cgwbs

On Sat, 14 Oct 2023 20:55:11 +0800, Jingbo Xu wrote:
> The cgwb cleanup routine will try to release the dying cgwb by switching
> the attached inodes.  It fetches the attached inodes from wb->b_attached
> list, omitting the fact that inodes only with dirty timestamps reside in
> wb->b_dirty_time list, which is the case when lazytime is enabled.  This
> causes enormous zombie memory cgroup when lazytime is enabled, as inodes
> with dirty timestamps can not be switched to a live cgwb for a long time.
> 
> [...]

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/1] writeback, cgroup: switch inodes with dirty timestamps to release dying cgwbs
      https://git.kernel.org/vfs/vfs/c/27890db5162c