Re: [PATCH 6/6] mm/migrate: export whether or not node is toptier in sysf

[Dave Hansen]

On 4/16/22 20:49, Davidlohr Bueso wrote:
> This allows userspace to know if the node is considered fast
> memory (with CPUs attached to it). While this can be already
> derived without a new file, this helps further encapsulate the
> concept.

What is userspace supposed to *do* with this, though?

What does "attached" mean?

Isn't it just asking for trouble to add (known) redundancy to the ABI?
It seems like a recipe for future inconsistency.