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authorBarton E. Schaefer <schaefer@zsh.org>2015-10-31 09:54:04 -0700
committerBarton E. Schaefer <schaefer@zsh.org>2015-10-31 09:54:04 -0700
commit682e779a211fdfa0baa41c06d821f0ea9acf4941 (patch)
treee82428bd72b6a0b4049eb6ee215c859b8d69c8af /Src
parent0e510f0c3522c9b18e9320388dd232a84fa79351 (diff)
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unposted (cf. 36998,36999): undo 36956 / restore 34451 with expanded comment about the flip-flopping
Diffstat (limited to 'Src')
-rw-r--r--Src/mem.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/Src/mem.c b/Src/mem.c
index 62d18d0cd..e31145e1e 100644
--- a/Src/mem.c
+++ b/Src/mem.c
@@ -79,16 +79,15 @@
 
 #include <sys/mman.h>
 
-#if 0
 /*
- * This change was designed to enable use of memory mapping on MacOS.
+ * This definition is 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().
+ * somewhat slower to allocate than memory from malloc(), so whether
+ * using this improves performance depends on details of zhalloc().
  */
 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
 #define MAP_ANONYMOUS MAP_ANON
 #endif
-#endif /* 0 */
 
 #if defined(MAP_ANONYMOUS) && defined(MAP_PRIVATE)