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SubjectRe: [PATCH v5 0/5] Add movablecore_map boot option
On Mon, 2013-01-14 at 14:34 -0800, Andrew Morton wrote:
> On Mon, 14 Jan 2013 09:31:33 -0800
> "H. Peter Anvin" <> wrote:
> > On 01/14/2013 01:15 AM, Tang Chen wrote:
> > >
> > > For now, users can disable this functionality by not specifying the boot option.
> > > Later, we will post SRAT support, and add another option value "movablecore_map=acpi"
> > > to using SRAT.
> > >
> >
> > I still think the option "movablecore_map" is uglier than hell. "core"
> > could just as easily refer to CPU cores there, but it is a memory mem.
> > "movablemem" seems more appropriate.
> >
> > Again, without SRAT I consider this patchset to be largely useless for
> > anything other than prototyping work.
> >
> hm, why. Obviously SRAT support will improve things, but is it
> actually unusable/unuseful with the command line configuration?

I think it is useful for prototyping and testing. I do not think it is
suitable for regular users.

> Also, "But even if we can use SRAT, users still need an interface to
> enable/disable this functionality if they don't want to loose their
> NUMA performance. So I think, an user interface is always needed."

Yes, but such user interface could be provided through the management
interface (GUI/CLI) of the platforms (or VMs). If user sets for
performance, SRAT could be generated with no hot-pluggable memory. If
user sets node N to be hot-removable, SRAT could be generated in such
way that all memory ranges in node N are hot-pluggable.


> There's also the matter of other architectures. Has any thought been
> given to how (eg) powerpc would hook into here?
> And what about VMs (xen, KVM)? I wonder if there is a case for those
> to implement memory hotplug.
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