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Re: [PATCH v4 2/2] xen: add helpers to allocate unpopulated memory
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
- Date: Thu, 13 Aug 2020 08:33:37 +0100
- Cc: linux-kernel@xxxxxxxxxxxxxxx, Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>, David Airlie <airlied@xxxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Dan Carpenter <dan.carpenter@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Yan Yankovskyi <yyankovskyi@xxxxxxxxx>, dri-devel@xxxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, David Hildenbrand <david@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>
- Delivery-date: Thu, 13 Aug 2020 07:34:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Aug 11, 2020 at 11:44:47AM +0200, Roger Pau Monne wrote:
> If enabled (because ZONE_DEVICE is supported) the usage of the new
> functionality untangles Xen balloon and RAM hotplug from the usage of
> unpopulated physical memory ranges to map foreign pages, which is the
> correct thing to do in order to avoid mappings of foreign pages depend
> on memory hotplug.
So please just select ZONE_DEVICE if this is so much better rather
than maintaining two variants.
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