[okr]

I can imagine, OSes in general are not prepared to such reported numbers shrinking. There would be a hole.

What if a moment ago my OS has still 64G and then all of the sudden it only has 63G. Where would the data go? I think something has to make up for the loss.

For me it makes sense to report logically 64G and internally you do the remapping magic.

I wonder, how some OSes deal with a hot-swap of RAM. You have a big virtual address space and all of the sudden there is no physical memory behind it.

Hm.