On 2021-Aug-28, Andres Freund wrote: > While rebasing the aio patchset ontop of HEAD I noticed that this commit added > another atomic operation to XLogWrite() with archiving enabled. The WAL write > path is really quite hot, and at least some of the > NotifySegmentsReadyForArchive() calls are done while WALWriteLock is held. > > I think we should at least try to make the fast-path where no segment > boundaries were crossed use no atomic operations.
I think the best way to achieve this is is to rely completely on walwriter doing the segment notification, so that the WAL write done by backend would only do a latch set. -- Álvaro Herrera Valdivia, Chile — https://www.EnterpriseDB.com/
