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Re: [PATCH v4 2/2] xen: add helpers to allocate unpopulated memory
- To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Thu, 13 Aug 2020 09:54:20 +0200
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- 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>
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On Thu, Aug 13, 2020 at 08:33:37AM +0100, Christoph Hellwig wrote:
> 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.
We still need to other variant for Arm at least, so both need to be
maintained anyway, even if we force ZONE_DEVICE on x86.
Thanks, Roger.
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