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Adjust OLDSERXID_MAX_PAGE based on BLCKSZ.

The value when BLCKSZ = 8192 is unchanged, but with larger-than-normalblock sizes we might need to crank things back a bit, as we'll havemore entries per page than normal in that case.Kevin Grittner

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src/backend/storage/lmgr
- predicate.c

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`‎src/backend/storage/lmgr/predicate.c`

Lines changed: 7 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -305,7 +305,13 @@ static SlruCtlData OldSerXidSlruCtlData;`
`305`	`305`	`#defineOLDSERXID_PAGESIZEBLCKSZ`
`306`	`306`	`#defineOLDSERXID_ENTRYSIZEsizeof(SerCommitSeqNo)`
`307`	`307`	`#defineOLDSERXID_ENTRIESPERPAGE(OLDSERXID_PAGESIZE / OLDSERXID_ENTRYSIZE)`
`308`		`-#defineOLDSERXID_MAX_PAGE(SLRU_PAGES_PER_SEGMENT * 0x10000 - 1)`
	`308`	`+`
	`309`	`+/*`
	`310`	`+ * Set maximum pages based on the lesser of the number needed to track all`
	`311`	`+ * transactions and the maximum that SLRU supports.`
	`312`	`+ */`
	`313`	`+#defineOLDSERXID_MAX_PAGEMin(SLRU_PAGES_PER_SEGMENT * 0x10000 - 1, \`
	`314`	`+(MaxTransactionId + 1) / OLDSERXID_ENTRIESPERPAGE - 1)`
`309`	`315`
`310`	`316`	`#defineOldSerXidNextPage(page) (((page) >= OLDSERXID_MAX_PAGE) ? 0 : (page) + 1)`
`311`	`317`

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Commit5b2b444

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`‎src/backend/storage/lmgr/predicate.c`

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