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From:   Pasha Tatashin <pasha.tatashin@soleen.com>
Date:   Tue, 5 Dec 2023 21:57:36 -0500
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Subject: Re: [PATCH v6 0/1] mm: report per-page metadata information
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Sourav Panda <souravpanda@google.com>, corbet@lwn.net,
        rafael@kernel.org, akpm@linux-foundation.org,
        mike.kravetz@oracle.com, muchun.song@linux.dev, rppt@kernel.org,
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Hi Greg,

Sourav removed the new field from sys/device../nodeN/meminfo as you
requested; however, in nodeN/vmstat fields still get appended, as
there is code that displays every item in zone_stat_item,
node_stat_item without option to opt-out. I mentioned it to you at
LPC.

In my IOMMU [1] series, there are also fields that are added to
node_stat_item that as result are appended to nodeN/vmstat.

Pasha

[1] https://lore.kernel.org/all/20231130201504.2322355-1-pasha.tatashin@sol=
een.com

On Tue, Dec 5, 2023 at 9:36=E2=80=AFPM Greg KH <gregkh@linuxfoundation.org>=
 wrote:
>
> On Tue, Dec 05, 2023 at 02:31:17PM -0800, Sourav Panda wrote:
> > Changelog:
> > v6:
> >       - Interface changes
> >               - Added per-node nr_page_metadata and
> >                 nr_page_metadata_boot fields that are exported
> >                 in /sys/devices/system/node/nodeN/vmstat
>
> Again, please do not add any new fields to existing sysfs files, that's
> not going to work well.  You can add a new sysfs file, that's file, but
> do not continue the abuse of the sysfs api in this file.
>
> thanks,
>
> greg k-h