Update README on allocators

diff --git a/README b/README
index e3054887610307089445433789359dc6b388be8f..3920b53428416c8d16c431ea8daa11cdba47cc42 100644 (file)
--- a/README
+++ b/README
@@ -26,18 +26,19 @@ NOTE: if after building Redis with a 32 bit target you need to rebuild it
 Allocator
 ---------
 
-By default Redis compiles and links against jemalloc under Linux, since
-glibc malloc() has memory fragmentation problems.
+Selecting a non-default memory allocator when building Redis is done by setting
+the `MALLOC` environment variable. Redis is compiled and linked against libc
+malloc by default, with the exception of jemalloc being the default on Linux
+systems. This default was picked because jemalloc has proven to have fewer
+fragmentation problems than libc malloc.
 
-To force a libc malloc() build use:
+To force compiling against libc malloc, use:
 
-    % make FORCE_LIBC_MALLOC=yes
+    % make MALLOC=libc
 
-In all the other non Linux systems the libc malloc() is used by default.
+To compile against jemalloc on Mac OS X systems, use:
 
-On Mac OS X you can force a jemalloc based build using the following:
-
-    % make USE_JEMALLOC=yes
+    % make MALLOC=jemalloc
 
 Verbose build
 -------------