Re: [PATCH v1 3/3] mm/memory_hotplug: skip adjust_managed_page_count() for PageOffline() pages when offlining

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To: David Hildenbrand <david@xxxxxxxxxx>
Subject: Re: [PATCH v1 3/3] mm/memory_hotplug: skip adjust_managed_page_count() for PageOffline() pages when offlining
From: Oscar Salvador <osalvador@xxxxxxx>
Date: Mon, 10 Jun 2024 06:29:13 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Wei Liu <wei.liu@xxxxxxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Jason Wang <jasowang@xxxxxxxxxx>, Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>, Eugenio Pérez <eperezma@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>
In-reply-to: <20240607090939.89524-4-david@redhat.com>
References: <20240607090939.89524-1-david@redhat.com> <20240607090939.89524-4-david@redhat.com>

On Fri, Jun 07, 2024 at 11:09:38AM +0200, David Hildenbrand wrote:
> We currently have a hack for virtio-mem in place to handle memory
> offlining with PageOffline pages for which we already adjusted the
> managed page count.
> 
> Let's enlighten memory offlining code so we can get rid of that hack,
> and document the situation.
> 
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>

Acked-by: Oscar Salvador <osalvador@xxxxxxx>

-- 
Oscar Salvador
SUSE Labs

Follow-Ups:
- Re: [PATCH v1 3/3] mm/memory_hotplug: skip adjust_managed_page_count() for PageOffline() pages when offlining
  - From: David Hildenbrand

References:
- [PATCH v1 0/3] mm/memory_hotplug: use PageOffline() instead of PageReserved() for !ZONE_DEVICE
  - From: David Hildenbrand
- [PATCH v1 3/3] mm/memory_hotplug: skip adjust_managed_page_count() for PageOffline() pages when offlining
  - From: David Hildenbrand

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