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Clamp result of MultiXactMemberFreezeThreshold

The purpose of the function is to reduce the effectiveautovacuum_multixact_freeze_max_age if the multixact members SLRU isapproaching wraparound, to make multixid freezing more aggressive.The returned value should therefore never be greater than plainautovacuum_multixact_freeze_max_age.Reviewed-by: Robert HaasDiscussion:https://www.postgresql.org/message-id/85fb354c-f89f-4d47-b3a2-3cbd461c90a3@iki.fiBackpatch-through: 12, all supported versions

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src/backend/access/transam
- multixact.c

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`‎src/backend/access/transam/multixact.c`

Lines changed: 8 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -2832,6 +2832,7 @@ MultiXactMemberFreezeThreshold(void)`
`2832`	`2832`	`uint32multixacts;`
`2833`	`2833`	`uint32victim_multixacts;`
`2834`	`2834`	`doublefraction;`
	`2835`	`+intresult;`
`2835`	`2836`
`2836`	`2837`	`/* If we can't determine member space utilization, assume the worst. */`
`2837`	`2838`	`if (!ReadMultiXactCounts(&multixacts,&members))`
`@@ -2853,7 +2854,13 @@ MultiXactMemberFreezeThreshold(void)`
`2853`	`2854`	`/* fraction could be > 1.0, but lowest possible freeze age is zero */`
`2854`	`2855`	`if (victim_multixacts>multixacts)`
`2855`	`2856`	`return0;`
`2856`		`-returnmultixacts-victim_multixacts;`
	`2857`	`+result=multixacts-victim_multixacts;`
	`2858`	`+`
	`2859`	`+/*`
	`2860`	`+ * Clamp to autovacuum_multixact_freeze_max_age, so that we never make`
	`2861`	`+ * autovacuum less aggressive than it would otherwise be.`
	`2862`	`+ */`
	`2863`	`+returnMin(result,autovacuum_multixact_freeze_max_age);`
`2857`	`2864`	`}`
`2858`	`2865`
`2859`	`2866`	`typedefstructmxtruncinfo`

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Commit7768ac1

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`‎src/backend/access/transam/multixact.c`

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