linux-kernel - Re: [PATCH v2 0/5] mm/page_owner: add debugfs files 'show_handles' and 'show_stacks

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Message-Id: <20251008193223.f0e7c243bef94b7db22070fb@linux-foundation.org>
Date: Wed, 8 Oct 2025 19:32:23 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Mauricio Faria de Oliveira <mfo@...lia.com>
Cc: Michal Hocko <mhocko@...e.com>, Vlastimil Babka <vbabka@...e.cz>, Oscar
 Salvador <osalvador@...e.de>, Suren Baghdasaryan <surenb@...gle.com>,
 Brendan Jackman <jackmanb@...gle.com>, Johannes Weiner
 <hannes@...xchg.org>, Zi Yan <ziy@...dia.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, kernel-dev@...lia.com
Subject: Re: [PATCH v2 0/5] mm/page_owner: add debugfs files 'show_handles'
 and 'show_stacks_handles'

On Wed,  1 Oct 2025 14:56:06 -0300 Mauricio Faria de Oliveira <mfo@...lia.com> wrote:

> Fortunately, the kernel can provide a unique identifier for stack traces
> in page_owner, which is the handle number in stackdepot. This eliminates
> the need for creating keys (hashing) in userspace during post-processing.

Looks nice, thanks.

I'm surprised that our in-tree userspace tooling for page_owner seems
rather weak.  Nobody has touched tools/mm/page_owner_sort.c in two
years.