On Mon, Nov 09, 2020 at 08:32:13PM -0500, Tom Lane wrote: > Do we really need exclusive lock on the ProcArray to make this flag > change? That seems pretty bad from a concurrency standpoint.
Any place where we update vacuumFlags acquires an exclusive LWLock on ProcArrayLock. That's held for a very short time, so IMO it won't matter much in practice, particularly if you compare that with the potential gains related to the existing wait phases. -- Michael
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