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Make autovacuum launcher more responsive to pg_log_backend_memory_contexts().

Previously when pg_log_backend_memory_contexts() sent the request tothe autovacuum launcher, it could take more than several seconds tolog its memory contexts. Because the function (HandleAutoVacLauncherInterrupts)to process any new interrupts that autovacuum launcher receiveddidn't handle the request for logging of memory contexts. This commit changesthe function so that it handles the request, to make autovacuum launchermore responsitve to pg_log_backend_memory_contexts().Back-patch to v14 where pg_log_backend_memory_contexts() was added.Author: Koyu TanigawaReviewed-by: Bharath Rupireddy, Atsushi TorikoshiDiscussion:https://postgr.es/m/0aae3e074face409b35153451be5cc11@oss.nttdata.com

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src/backend/postmaster
- autovacuum.c

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`‎src/backend/postmaster/autovacuum.c`

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Original file line number	Diff line number	Diff line change
`@@ -836,6 +836,10 @@ HandleAutoVacLauncherInterrupts(void)`
`836`	`836`	`if (ProcSignalBarrierPending)`
`837`	`837`	`ProcessProcSignalBarrier();`
`838`	`838`
	`839`	`+/* Perform logging of memory contexts of this process */`
	`840`	`+if (LogMemoryContextPending)`
	`841`	`+ProcessLogMemoryContextInterrupt();`
	`842`	`+`
`839`	`843`	`/* Process sinval catchup interrupts that happened while sleeping */`
`840`	`844`	`ProcessCatchupInterrupt();`
`841`	`845`	`}`

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Commit62e821a

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`‎src/backend/postmaster/autovacuum.c`

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