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Date: Mon, 16 Mar 2026 10:25:39 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: SeongJae Park <sj@kernel.org>
Cc: "# 6 . 17 . x" <stable@vger.kernel.org>, damon@lists.linux.dev,
 linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v2] mm/damon/stat: monitor all System RAM resources
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On Sun, 15 Mar 2026 09:27:15 -0700 SeongJae Park <sj@kernel.org> wrote:

> DAMON_STAT usage document (Documentation/admin-guide/mm/damon/stat.rst)
> says it monitors the system's entire physical memory.  But, it is
> monitoring only the biggest System RAM resource of the system.  When
> there are multiple System RAM resources, this results in monitoring only
> an unexpectedly small fraction of the physical memory.  For example,
> suppose the system has a 500 GiB System RAM, 10 MiB non-System RAM, and
> 500 GiB System RAM resources in order on the physical address space.
> DAMON_STAT will monitor only the first 500 GiB System RAM.  This
> situation is particularly common on NUMA systems.
> 
> Select a physical address range that covers all System RAM areas of the
> system, to fix this issue and make it work as documented.
> 
> Fixes: 369c415e6073 ("mm/damon: introduce DAMON_STAT module")
> Cc: <stable@vger.kernel.org> # 6.17.x

This doesn't apply to current mainline?