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SubjectRe: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support

* Christoph Lameter <cl@linux-foundation.org> wrote:

> On Tue, 30 Jun 2009, Ingo Molnar wrote:
>
> > But what if not? What if the kernel can run on up to 4096 CPUs
> > and runs on a big box. Why should a virtual machine have the
> > illogical choice between either wasting a lot of RAM
> > preallocating stuff, or limiting its own extendability.
>
> The kernel may be able to run on 4096 but the machines config
> information that is available via ACPI knows how many processors
> the machine we are booting on is able to add.

I think we might be talking past each other.

The usecase i'm talking about is to boot a generic,
many-CPUs-capable kernel in a guest image.

How would you allow that guest to stay on 2 virtual CPUs but still
be able to hot-plug many other CPUs if the guest context rises above
its original CPU utilization?

Ingo


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