Hi, On 2020-09-11 19:10:05 -0300, Alvaro Herrera wrote: > Andres suggested in [1] to use atomics for the counters together with a > single lwlock to be used in shared mode only. I didn't quite understand > what the lwlock is *for*, but maybe you do. > > [1] https://postgr.es/m/20200629231015.qlej5b3qpfe4u...@alap3.anarazel.de
Just to be clear - I am saying that in the first iteration I would just straight up replace the spinlock with an lwlock, i.e. having many lwlocks. The piece about a single shared lwlocks is/was about protecting the set of entries that are currently in-memory - which can't easily be implemented just using atomics (at least without the risk of increasing the counters of an entry since replaced with another query). Greetings, Andres Freund
