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

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Date: Wed, 7 Feb 2024 15:05:03 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Sourav Panda <souravpanda@...gle.com>
Cc: corbet@....net, gregkh@...uxfoundation.org, rafael@...nel.org,
 mike.kravetz@...cle.com, muchun.song@...ux.dev, rppt@...nel.org,
 david@...hat.com, rdunlap@...radead.org, chenlinxuan@...ontech.com,
 yang.yang29@....com.cn, tomas.mudrunka@...il.com, bhelgaas@...gle.com,
 ivan@...udflare.com, pasha.tatashin@...een.com, yosryahmed@...gle.com,
 hannes@...xchg.org, shakeelb@...gle.com, kirill.shutemov@...ux.intel.com,
 wangkefeng.wang@...wei.com, adobriyan@...il.com, vbabka@...e.cz,
 Liam.Howlett@...cle.com, surenb@...gle.com, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-mm@...ck.org, willy@...radead.org, weixugc@...gle.com
Subject: Re: [PATCH v7 0/1] mm: report per-page metadata information

On Mon, 29 Jan 2024 14:42:03 -0800 Sourav Panda <souravpanda@...gle.com> 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.