1 files changed, 20 insertions, 0 deletions
diff --git a/src/alloc.c b/src/alloc.c
index ead83fe0fb4..dcdbd65d85e 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -2010,6 +2010,25 @@ compact_strings ()
     }
 }
 
+/* Debugging aids.  */
+
+DEFUN ("memory-limit", Fmemory_limit, Smemory_limit, 0, 0, "",
+  "Return the address of the last byte Emacs has allocated, divided by 1024.\n\
+This may be helpful in debugging Emacs's memory usage.\n\
+If called interactively, print the result in the minibuffer.")
+  ()
+{
+  Lisp_Object end;
+
+  XSET (end, Lisp_Int, (int) sbrk (0));
+
+  if (! NILP (Finteractive_p))
+    message ("Memory limit at %dk.", XINT (end));
+
+  return end;
+}
+
+
 /* Initialization */
 
 init_alloc_once ()
@@ -2100,4 +2119,5 @@ which includes both saved text and other data.");
   defsubr (&Smake_marker);
   defsubr (&Spurecopy);
   defsubr (&Sgarbage_collect);
+  defsubr (&Smemory_limit);
 }