Reduce memory consumption during VACUUM of large relations, by using

FSMPageData (6 bytes) instead of PageFreeSpaceInfo (8 or 16 bytes)
for the temporary array of page-free-space information.

Itagaki Takahiro

1 files changed, 2 insertions, 12 deletions

diff --git a/src/include/storage/freespace.h b/src/include/storage/freespace.h
index 0ef828ed54..86dd22647c 100644
--- a/src/include/storage/freespace.h
+++ b/src/include/storage/freespace.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/storage/freespace.h,v 1.27 2008/01/01 19:45:59 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/storage/freespace.h,v 1.28 2008/03/10 02:04:10 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -18,16 +18,6 @@
 #include "storage/itemptr.h"
 
 
-/*
- * exported types
- */
-typedef struct PageFreeSpaceInfo
-{
-	BlockNumber blkno;			/* which page in relation */
-	Size		avail;			/* space available on this page */
-} PageFreeSpaceInfo;
-
-
 /* Initial value for average-request moving average */
 #define INITIAL_AVERAGE ((Size) (BLCKSZ / 32))
 
@@ -144,7 +134,7 @@ extern Size GetAvgFSMRequestSize(RelFileNode *rel);
 extern void RecordRelationFreeSpace(RelFileNode *rel,
 						BlockNumber interestingPages,
 						int nPages,
-						PageFreeSpaceInfo *pageSpaces);
+						FSMPageData *pageSpaces);
 
 extern BlockNumber GetFreeIndexPage(RelFileNode *rel);
 extern void RecordIndexFreeSpace(RelFileNode *rel,