linux-kernel - Re: [RFC PATCH] memory,memory_hotplug: allow restricting memory blocks to zone movable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <7f053290-6b9a-4d18-936e-0f28006c79c3@kernel.org>
Date: Tue, 6 Jan 2026 16:24:21 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Gregory Price <gourry@...rry.net>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com, osalvador@...e.de,
 gregkh@...uxfoundation.org, rafael@...nel.org, dakr@...nel.org,
 akpm@...ux-foundation.org, lorenzo.stoakes@...cle.com,
 Liam.Howlett@...cle.com, vbabka@...e.cz, rppt@...nel.org, surenb@...gle.com,
 mhocko@...e.com, hare@...e.de
Subject: Re: [RFC PATCH] memory,memory_hotplug: allow restricting memory
 blocks to zone movable

> +/*
> + * Restrict hotplugged memory blocks to ZONE_MOVABLE only.
> + *
> + * During offlining of hotplugged memory which was originally onlined
> + * as ZONE_MOVABLE, userland services may detect blocks going offline
> + * and automatically re-online them into ZONE_NORMAL or lower.  When
> + * this happens it may become permanently incapable of being removed.

If it's really only that, we could also look into simply making a 
re-online without a specific mode ("online") to use the previous mode.

We could glue that to the "contig-zones" policy only, to not affect 
"auto-movable".

That is, remember the zone to which it was previously onlined, and then 
simply re-online to that one.

-- 
Cheers

David