On Fri, 11 Apr 2014, Dave Hansen wrote: > > So? Who cares if there are non-addressable holes in part of the span? > > Ulrich, correct me if I'm wrong, but it seems you're looking for just a > > address-to-nodeid mapping (or pfn-to-nodeid mapping) and aren't actually > > expecting that there are no holes in a node for things like acpi or I/O or > > reserved memory. > ... > > I think trying to represent holes and handling different memory models and > > hotplug in special ways is complete overkill. > > This isn't just about memory hotplug or different memory models. There > are systems out there today, in production, that have layouts like this: > > |------Node0-----| > |------Node1-----| > > and this: > > |------Node0-----| > |-Node1-| > What additional information, in your opinion, can we export to assist userspace in making this determination that $address is on $nid? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>