linux-kernel - Re: [PATCH] mm/vmstat: Fix placement of per-node stats in /proc/zoneinfo

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Message-Id: <20240725124710.76206c2c9baa27b8463b825d@linux-foundation.org>
Date: Thu, 25 Jul 2024 12:47:10 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Shivank Garg <shivankg@....com>
Cc: <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>, <vbabka@...e.cz>,
 <hillf.zj@...baba-inc.com>, <mgorman@...hsingularity.net>,
 <hannes@...xchg.org>
Subject: Re: [PATCH] mm/vmstat: Fix placement of per-node stats in
 /proc/zoneinfo

On Thu, 25 Jul 2024 16:26:26 +0530 Shivank Garg <shivankg@....com> wrote:

> The per-node stats in /proc/zoneinfo output are incorrectly inserted
> between the first populated zone title and its specific stats. This
> creates confusion while reading or parsing its output.

I pity anyone who has to write a parser for that mess.

> This patch relocates the per-node stats at the beginning for each node,
> followed by the individual zone statistics. This fix results in a clearer
> and more consistent output format.

> Fixes: e2ecc8a79ed4 ("mm, vmstat: print node-based stats in zoneinfo file")

It's been this way since 2016?  Surely there's a risk of breaking
existing userspace parsers?