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Adjust OLDSERXID_MAX_PAGE based on BLCKSZ.

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

Kevin Grittner
This commit is contained in:
Robert Haas
2011-07-07 15:05:21 -04:00
parent ec1339ea5c
commit a392b52478
1 changed files with 7 additions and 1 deletions
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8
src/backend/storage/lmgr/predicate.c
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@@ -305,7 +305,13 @@ static SlruCtlData OldSerXidSlruCtlData;
#define OLDSERXID_PAGESIZE BLCKSZ
#define OLDSERXID_ENTRYSIZE sizeof(SerCommitSeqNo)
#define OLDSERXID_ENTRIESPERPAGE (OLDSERXID_PAGESIZE / OLDSERXID_ENTRYSIZE)
#define OLDSERXID_MAX_PAGE (SLRU_PAGES_PER_SEGMENT * 0x10000 - 1)
/*
* Set maximum pages based on the lesser of the number needed to track all
* transactions and the maximum that SLRU supports.
*/
#define OLDSERXID_MAX_PAGE Min(SLRU_PAGES_PER_SEGMENT * 0x10000 - 1, \
(MaxTransactionId + 1) / OLDSERXID_ENTRIESPERPAGE - 1)
#define OldSerXidNextPage(page) (((page) >= OLDSERXID_MAX_PAGE) ? 0 : (page) + 1)