More detail on the use of MALLOC_DEBUG

diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index 069fed5..2f2276f 100644 (file)
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -976,10 +976,18 @@ config UCLIBC_MALLOC_DEBUGGING
        default n
        help
          Answer Y here to compile extra debugging support code into malloc.
-         Malloc debugging output may then be enabled at runtime using
-         the MALLOC_DEBUG environment variable.  Because this increases
-         the size of malloc appreciably (due to strings etc), you
-         should say N unless you need to debug a malloc problem.
+         Malloc debugging output may then be enabled at runtime using the
+         MALLOC_DEBUG environment variable.
+
+         The value of MALLOC_DEBUG should be an integer, which is interpreted as
+         a bitmask with the following bits:
+                 1   -  do extra consistency checking
+                 2   -  output messages for malloc/free calls and OS allocation calls
+                 4   -  output messages for the `MMB' layer
+                 8   -  output messages for internal malloc heap manipulation calls
+         
+         Because this increases the size of malloc appreciably (due to strings
+         etc), you should say N unless you need to debug a malloc problem.
 
 config UCLIBC_MJN3_ONLY
        bool "Manuel's hidden warnings"