linux-kernel - Re: [PATCH v5 1/1] mm: report per-page metadata information

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Message-ID: <2023110205-enquirer-sponge-4f35@gregkh>
Date:   Thu, 2 Nov 2023 06:42:06 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sourav Panda <souravpanda@...gle.com>
Cc:     corbet@....net, rafael@...nel.org, akpm@...ux-foundation.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 v5 1/1] mm: report per-page metadata information

On Wed, Nov 01, 2023 at 04:08:16PM -0700, Sourav Panda wrote:
> Adds a new per-node PageMetadata field to
> /sys/devices/system/node/nodeN/meminfo

No, this file is already an abuse of sysfs and we need to get rid of it
(it has multiple values in one file.)  Please do not add to the
nightmare by adding new values.

Also, even if you did want to do this, you didn't document it properly
in Documentation/ABI/ :(

thanks,

greg k-h