Re: [RFC PATCHv3 00/11] Intermix Lowmem and vmalloc

[Laura Abbott]

On 1/3/2014 10:23 AM, Dave Hansen wrote:
> On 01/02/2014 01:53 PM, Laura Abbott wrote:
> > The goal here is to allow as much lowmem to be mapped as if the block of memory
> > was not reserved from the physical lowmem region. Previously, we had been
> > hacking up the direct virt <-> phys translation to ignore a large region of
> > memory. This did not scale for multiple holes of memory however.
>
> How much lowmem do these holes end up eating up in practice, ballpark?
> I'm curious how painful this is going to get.

In total, the worst case can be close to 100M with an average case 
around 70M-80M. The split and number of holes vary with the layout but 
end up with 60M-80M one hole and the rest in the other.

Thanks,
Laura

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