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Simplify autovacuum work-item implementation
The initial implementation of autovacuum work-items used a dynamicshared memory area (DSA). However, it's argued that dynamic sharedmemory is not portable enough, so we cannot rely on it being supportedeverywhere; at the same time, autovacuum work-items are now a criticalpart of the server, so it's not acceptable that they don't work in thecases where dynamic shared memory is disabled. Therefore, let's fallback to a simpler implementation of work-items that just usesautovacuum's main shared memory segment for storage.Discussion:https://postgr.es/m/CA+TgmobQVbz4K_+RSmiM9HeRKpy3vS5xnbkL95gSEnWijzprKQ@mail.gmail.com1 parentedbad25 commitf2f9fcb
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