Re: [PATCH 4/4] mm: numa: Slow PTE scan rate if migration failures occur

Linus Torvalds
2015-03-09T16:52:20Z

On Mon, Mar 9, 2015 at 4:29 AM, Dave Chinner <david@fromorbit.com> wrote:
>
>> Also, is there some sane way for me to actually see this behavior on a
>> regular machine with just a single socket? Dave is apparently running
>> in some fake-numa setup, I'm wondering if this is easy enough to
>> reproduce that I could see it myself.
>
> Should be - I don't actually use 500TB of storage to generate this -
> 50GB on an SSD is all you need from the storage side. I just use a
> sparse backing file to make it look like a 500TB device. :P

What's your virtual environment setup? Kernel config, and
virtualization environment to actually get that odd fake NUMA thing
happening?

Linus