From c8a6b527050806d3e12d6002db16d5b93c644303 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sat, 14 May 2005 23:16:29 +0000
Subject: [PATCH] Further marginal speed hacking: in MemoryContextReset, don't
 call MemoryContextResetChildren unless necessary.

---
 src/backend/utils/mmgr/mcxt.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/backend/utils/mmgr/mcxt.c b/src/backend/utils/mmgr/mcxt.c
index c5a2311bc5..6d68e30f7e 100644
--- a/src/backend/utils/mmgr/mcxt.c
+++ b/src/backend/utils/mmgr/mcxt.c
@@ -14,7 +14,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/mmgr/mcxt.c,v 1.54 2005/02/18 21:52:33 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/mmgr/mcxt.c,v 1.55 2005/05/14 23:16:29 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -123,7 +123,10 @@ MemoryContextReset(MemoryContext context)
 {
 	AssertArg(MemoryContextIsValid(context));
 
-	MemoryContextResetChildren(context);
+	/* save a function call in common case where there are no children */
+	if (context->firstchild != NULL)
+		MemoryContextResetChildren(context);
+
 	(*context->methods->reset) (context);
 }
 
-- 
GitLab