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

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To: Oscar Salvador <osalvador@xxxxxxx>
Subject: Re: [PATCH v1 3/3] mm/memory_hotplug: skip adjust_managed_page_count() for PageOffline() pages when offlining
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Mon, 10 Jun 2024 10:56:18 +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: <ZmaBGSqchtEWnqM1@localhost.localdomain>
Organization: Red Hat
References: <20240607090939.89524-1-david@redhat.com> <20240607090939.89524-4-david@redhat.com> <ZmaBGSqchtEWnqM1@localhost.localdomain>
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On 10.06.24 06:29, Oscar Salvador wrote:

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>


Thanks for the review!

--
Cheers,

David / dhildenb

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

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