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From: Christoph Berg <[email protected]>
To: Tomas Vondra <[email protected]>
Cc: Tomas Vondra <[email protected]>
Cc: Jakub Wartak <[email protected]>
Cc: [email protected]
Subject: Re: failed NUMA pages inquiry status: Operation not permitted
Date: Thu, 16 Oct 2025 16:54:24 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

Re: Tomas Vondra
> It's probably more about the kernel version. What kernels are used by
> these systems?

It's the very same kernel, just different docker containers on the
same system. I did not investigate yet where the problem is coming
from, different libnuma versions seemed like the best bet.

Same (differing) results on both these systems:
Linux turing 6.16.7+deb14-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.16.7-1 (2025-09-11) x86_64 GNU/Linux
Linux jenkins 6.1.0-39-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.148-1 (2025-08-26) x86_64 GNU/Linux

> Not sure how would that work. It seems this is some sort of permission
> check in numa_move_pages, that's not what pg_numa_available does. Also,
> it may depending on the page queried (e.g. whether it's exclusive or
> shared by multiple processes).

It's probably the lack of some process capability in that environment.
Maybe there is a way to query that, but I don't know much about that
yet.

Christoph

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