On Fri, May 31, 2024 at 07:12:10AM -0700, Darrick J. Wong wrote: > There are <cough> some users that want 1G extents. > > For the rest of us who don't live in the stratosphere, it's convenient > for fsdax to have rt extents that match the PMD size, which could be > large on arm64 (e.g. 512M, or two smr sectors). That's fine. Maybe to rephrase my question. With this series we have 3 different truncate path: 1) unmap all blocks (!rt || rtextsizse == 1) 2) zero leftover blocks in an rtextent (small rtextsize, but > 1) 3) converted leftover block in an rtextent to unwritten (large rtextsize) What is the right threshold to switch between 2 and 3? And do we really need 2) at all?
