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diff --git a/lib/hipe/tools/hipe_jit.erl b/lib/hipe/tools/hipe_jit.erl
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+++ b/lib/hipe/tools/hipe_jit.erl
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+%% -*- erlang-indent-level: 2 -*-
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 2002-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Copyright (c) 2002 by Erik Johansson.  
+%% ====================================================================
+%%  Module   :	hipe_jit
+%%  Purpose  :  
+%%  Notes    : 
+%%  History  :	* 2002-03-14 Erik Johansson ([email protected]): Created.
+%% ====================================================================
+%% @doc
+%%    A tool to enable using the HiPE compiler as an automatic JIT
+%%    compiler rather than a user-controlled one.
+%% @end
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+-module(hipe_jit).
+
+-export([start/0]).
+
+-record(state, {mode = start     :: 'sleep' | 'start' | 'wait',
+	       	threshold = 5000 :: non_neg_integer(),
+		sleep = 5000     :: non_neg_integer(),
+		time = 1000      :: non_neg_integer()}).
+
+%%---------------------------------------------------------------------
+
+-spec start() -> pid().
+%% @doc
+%%    Starts an Erlang process which calls the HiPE compiler every
+%%    now and then (when it sees it fit to do so).
+%% @end
+start() ->
+  spawn(fun () -> loop(#state{}) end).
+
+loop(State) ->
+  case State#state.mode of
+    start ->
+      start(State);
+    wait ->
+      wait(State);
+    _ ->
+      sleep(State)
+  end.
+
+sleep(State) ->
+  receive
+    quit -> ok
+  after State#state.sleep ->
+    loop(State#state{mode=start})
+  end.
+
+start(State) ->
+  catch hipe_profile:prof(),
+  catch hipe_profile:clear(),
+  loop(State#state{mode=wait}).
+
+wait(State) ->
+  receive
+    quit -> ok
+  after State#state.time ->
+    R = [M || {M,C} <- (catch hipe_profile:mods_res()),
+			C > State#state.threshold],
+    catch hipe_profile:prof_off(),
+    lists:foreach(fun(M) ->
+		    io:format("Compile ~w\n",[M]),
+		    hipe:c(M,[o2,verbose])
+		  end, R)
+  end,
+  loop(State#state{mode=sleep}).