On Wed, Jun 27, 2018 at 12:52 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> A related question is if it matters - without complicating the code I
> don't see how we could release all the locks in that loop. Therefore no
> interrupts can be accepted. I hope I'm missing something?
I agree.
In general, page deletion is the most complicated part of nbtree
concurrency, by far (if we just had the basic L&Y, the concurrency
aspects would be far easier to grasp). Doing better in
_bt_unlink_halfdead_page() seems extremely difficult, and very
unlikely to be worthwhile.
--
Peter Geoghegan