ssi-slru-maxpage.patch

*** a/src/backend/storage/lmgr/predicate.c
--- b/src/backend/storage/lmgr/predicate.c
***************
*** 296,302 **** 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)
  
  #define OldSerXidNextPage(page) (((page) >= OLDSERXID_MAX_PAGE) ? 0 : (page) + 1)
  
--- 296,308 ----
  #define OLDSERXID_PAGESIZE			BLCKSZ
  #define OLDSERXID_ENTRYSIZE			sizeof(SerCommitSeqNo)
  #define OLDSERXID_ENTRIESPERPAGE	(OLDSERXID_PAGESIZE / OLDSERXID_ENTRYSIZE)
! 
! /*
!  * 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)