From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sat, 14 May 2005 23:16:29 +0000 (+0000)
Subject: Further marginal speed hacking: in MemoryContextReset, don't call
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=db837f15f2f6ca35e6f47f492f0afe885054e1d4;p=users%2Fbernd%2Fpostgres.git

Further marginal speed hacking: in MemoryContextReset, don't call
MemoryContextResetChildren unless necessary.
---

diff --git a/src/backend/utils/mmgr/mcxt.c b/src/backend/utils/mmgr/mcxt.c
index 925fdb9868..bcc397799a 100644
--- a/src/backend/utils/mmgr/mcxt.c
+++ b/src/backend/utils/mmgr/mcxt.c
@@ -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);
 }