From d2b5b55b87d3f519b7d95a65f2ac08fca2e6ea9d Mon Sep 17 00:00:00 2001
From: tedu <>
Date: Tue, 26 Jun 2012 21:36:25 +0000
Subject: [PATCH] after a talk with ariane, use MAP_FIXED for mquery to avoid
 the cost of scanning for free space if the hint isn't available. also, on
 further inspection, this will prevent pmap_prefer from "improving" our hint.

---
 src/lib/libc/stdlib/malloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/lib/libc/stdlib/malloc.c b/src/lib/libc/stdlib/malloc.c
index 7a48a0f2..7cab7058 100644
--- a/src/lib/libc/stdlib/malloc.c
+++ b/src/lib/libc/stdlib/malloc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: malloc.c,v 1.144 2012/06/22 01:30:17 tedu Exp $	*/
+/*	$OpenBSD: malloc.c,v 1.145 2012/06/26 21:36:25 tedu Exp $	*/
 /*
  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
  *
@@ -95,7 +95,7 @@
     MAP_ANON | MAP_PRIVATE, -1, (off_t) 0)
 
 #define MQUERY(a, sz)	mquery((a), (size_t)(sz), PROT_READ | PROT_WRITE, \
-    MAP_ANON | MAP_PRIVATE, -1, (off_t)0)
+    MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, (off_t)0)
 
 struct region_info {
 	void *p;		/* page; low bits used to mark chunks */