Re: [PATCHSET] percpu: generalize first chunk allocators and improvelpage NUMA support

From: H. Peter Anvin
Date: Thu Jun 25 2009 - 15:27:34 EST


Andi Kleen wrote:
>>>
>> *Ahem* virtual machines *ahem*...
>
> And? Even there's not that big typically.
>
> The traditional problem was just for 128 NR_CPUs kernel were nothing
> was sized based on machine capacity.
>
> Also on large systems the VMs shouldn't be sized for full capacity.
>

We have already have cases where the "possible" CPUs have eaten up the
entire vmalloc area on 32 bits. In real use. It's a real problem.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

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