Re: [PATCH v7 0/1] mm: report per-page metadata information

[Andrew Morton]

On Mon, 29 Jan 2024 14:42:03 -0800 Sourav Panda <souravpanda@xxxxxxxxxx> wrote:

> This patch adds two new per-node fields, namely nr_page_metadata and
> nr_page_metadata_boot to /sys/devices/system/node/nodeN/vmstat and a
> global PageMetadata field to /proc/meminfo. This information can be
> used by users to see how much memory is being used by per-page
> metadata, which can vary depending on build configuration, machine
> architecture, and system use.

I'm not seeing why this is very useful.  OK, you look at it and it
tells you a number, but what action can a user take based upon that
number?

Please tell us more about the value of this, the use cases, what
prompted you to expend effort on this.