On Mon, Mar 9, 2015 at 4:29 AM, Dave Chinner [off-list ref] wrote:

quoted

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