From 8934007f25600150cee7e6eda2816c9110a9dc69 Mon Sep 17 00:00:00 2001
From: "Barton E. Schaefer" <schaefer@zsh.org>
Date: Mon, 26 Oct 2015 07:19:01 -0700
Subject: 36956: revert 34451, mmap() is too slow on MacOS

---
 Src/mem.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'Src')

diff --git a/Src/mem.c b/Src/mem.c
index 158ad9641..3138bb1d5 100644
--- a/Src/mem.c
+++ b/Src/mem.c
@@ -79,9 +79,16 @@
 
 #include <sys/mman.h>
 
+#if 0
+/*
+ * This change was designed to enable use of memory mapping on MacOS.
+ * However, performance tests indicate that MacOS mapped regions are
+ * significantly slower to allocate than memory from malloc().
+ */
 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
 #define MAP_ANONYMOUS MAP_ANON
 #endif
+#endif /* 0 */
 
 #if defined(MAP_ANONYMOUS) && defined(MAP_PRIVATE)
 
-- 
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