From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 19 Jan 2006 00:27:27 +0000 (+0000)
Subject: Fix a tiny memory leak (one List header) in RelationCacheInvalidate().
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=a5465fe02514b05458ba7b6099d4d52447b2b966;p=users%2Fbernd%2Fpostgres.git

Fix a tiny memory leak (one List header) in RelationCacheInvalidate().
This is utterly insignificant in normal operation, but it becomes a
problem during cache inval stress testing.  The original coding in fact
had no leak --- the 8.0 List rewrite created the issue.  I wonder whether
list_concat should pfree the discarded header?
---

diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 06a75ffcaf..459014bd93 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1786,8 +1786,6 @@ RelationCacheInvalidate(void)
 		}
 	}
 
-	rebuildList = list_concat(rebuildFirstList, rebuildList);
-
 	/*
 	 * Now zap any remaining smgr cache entries.  This must happen before we
 	 * start to rebuild entries, since that may involve catalog fetches which
@@ -1796,6 +1794,12 @@ RelationCacheInvalidate(void)
 	smgrcloseall();
 
 	/* Phase 2: rebuild the items found to need rebuild in phase 1 */
+	foreach(l, rebuildFirstList)
+	{
+		relation = (Relation) lfirst(l);
+		RelationClearRelation(relation, true);
+	}
+	list_free(rebuildFirstList);
 	foreach(l, rebuildList)
 	{
 		relation = (Relation) lfirst(l);