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Date:   Wed, 23 Mar 2022 19:46:59 -0700
From:   Yang Shi <>
To:     "Theodore Ts'o" <>
Cc:     Vlastimil Babka <>,
        "Kirill A. Shutemov" <>,
        Miaohe Lin <>,
        Song Liu <>,
        Rik van Riel <>,
        Matthew Wilcox <>, Zi Yan <>,
        Andrew Morton <>,
        Andreas Dilger <>,, Linux MM <>,
        Linux FS-devel Mailing List <>,,,
        Linux Kernel Mailing List <>
Subject: Re: [v2 PATCH 0/8] Make khugepaged collapse readonly FS THP more consistent

On Wed, Mar 23, 2022 at 6:48 PM Theodore Ts'o <> wrote:
> On Thu, Mar 17, 2022 at 04:48:19PM -0700, Yang Shi wrote:
> >
> > The patch 1 ~ 7 are minor bug fixes, clean up and preparation patches.
> > The patch 8 converts ext4 and xfs.  We may need convert more filesystems,
> > but I'd like to hear some comments before doing that.
> Adding a hard-coded call to khugepage_enter_file() in ext4 and xfs,
> and potentially, each file system, seems kludgy as all heck.  Is there
> any reason not to simply call it in the mm code which calls f_op->mmap()?

Thanks, Ted. Very good point. I just didn't think of it. I think it is
doable. We may be able to clean up the code further.

>                                  - Ted

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