[jabl]

I recall back then Dillon had some unconventional ideas how to do SMP compared to the traditional approach of ever more fine-grained locking as done by FreeBSD and Linux. Is DragonFlyBSD still following this design, and if so, how well did it work out, or if not, did they revert to a more traditional approach?

[loeg]

I don't follow DFBSD development too closely, but it looks like they still have the somewhat novel lock tokens:

https://www.dragonflybsd.org/docs/developer/Locking_and_Sync...

I don't know how well it works for them or if they've gone back to using more typical locking more recently.