On Fri, Dec 20, 2019 at 04:32:13PM -0800, Dan Williams wrote:

quoted

quoted

There's already a limit, it's just a much larger one. :) What does "no limit"
really mean, numerically, to you in this case?

I guess I mean 'hidden limit' - hitting the limit and failing would
be managable.

I think 7 is probably too low though, but we are not using 1GB huge
pages, only 2M..

What about RDMA to 1GB-hugetlbfs and 1GB-device-dax mappings?

I don't think the failing testing is doing that.

It is also less likely that 1GB regions will need multi-mapping, IMHO.

Jason