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Re: [PATCH v4 2/2] xen: add helpers to allocate unpopulated memory
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Daniel Vetter <daniel@xxxxxxxx>
- Date: Thu, 13 Aug 2020 11:49:46 +0200
- Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, 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 09:49:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Mail-followup-to: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>, David Airlie <airlied@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>
On Thu, Aug 13, 2020 at 09:54:20AM +0200, Roger Pau Monné wrote:
> 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.
Why does arm not have ZONE_DEVICE?
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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