Profiling support, tools and documentation.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8375 a1c6a512-1295-4272-9138-f99709370657

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diff --git a/docs/FILES b/docs/FILES
index f1054ea..21f2faf 100644
--- a/docs/FILES
+++ b/docs/FILES
@@ -8,6 +8,7 @@ CUSTOM_WPS_FORMAT
 FAQ
 FILES
 HISTORY
+LICENSES
 NODO
 README
 TECH
diff --git a/docs/LICENSES b/docs/LICENSES
new file mode 100644
index 0000000..652a276
--- /dev/null
+++ b/docs/LICENSES
@@ -0,0 +1,36 @@
+This file contains license for software imported into Rockbox but governed by
+a previous license.  Each section begins by identifying the code in Rockbox
+and the source from of those code, and is followed by the license text.
+
+*************************************************************************
+In: profile.c, profile_func_enter
+From: gcc - gmon.c, mcount
+*************************************************************************
+Copyright (c) 1991, 1998 The Regents of the University of California.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. [rescinded 22 July 1999]
+4. Neither the name of the University nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
+@(#)gmon.c 5.3 (Berkeley) 5/22/91
diff --git a/docs/TECH b/docs/TECH
index 4532af3..b22a8c4 100644
--- a/docs/TECH
+++ b/docs/TECH
@@ -172,3 +172,29 @@ Charging
   controlled charging that Rockbox can't affect.)
 
   ...
+
+Profiling
+
+  Rockbox contains a profiling system which can be used to monitor call count
+  and time in function for a specific set of functions on a single thread.
+
+  To use this functionality:
+  1) Configure a developer build with profiling support.
+  2) Make sure that the functions of interest will be compiled with the
+     PROFILE_OPTS added to their CFLAGS
+  3) On the same thread as these functions will be run, surround the relevent
+     running time with calls to profile_thread and profstop.  (For codecs,
+     this can be done in the codec.c file for example)
+  4) Compile and run the code on the target, after the section to be profiled
+     exits (when profstop is called) a profile.out file will be written to
+     the player's root.
+  5) Use the tools/profile_reader/profile_reader.pl script to convert the 
+     profile.out into a human readable format.  This script requires the
+     relevent map files and object (or library) files created in the build.
+     (ex: ./profile_reader.pl profile.out vorbis.map libTremor.a 0)
+
+  There is also a profile_comparator.pl script which can compare two profile
+  runs as output by the above script to show percent change from optimization
+
+  profile_reader.pl requires a recent binutils that can automatically handle
+  target object files, or objdump in path to be the target-objdump.