On Thu, Dec 3, 2020 at 7:02 PM Tom Lane <t...@sss.pgh.pa.us> wrote: > From a system structural standpoint, I seriously dislike that lwlock.c > patch: putting machine-specific variant implementations into that file > seems like a disaster for maintainability. So it would need to show a > very significant gain across a range of hardware before I'd want to > consider adopting it ... and it has not shown that.
The current shape of the lwlock patch is experimental. I had quite a beautiful (in my opinion) idea to wrap platform-dependent parts of CAS-loops into macros. Then we could provide different low-level implementations of CAS-loops for Power, ARM and rest platforms with single code for LWLockAttempLock() and others. However, I see that modern ARM tends to efficiently implement LSE. Power doesn't seem to be very popular. So, I'm going to give up with this for now. ------ Regards, Alexander Korotkov