contrib: Note about what needs to be done for visualization.

diff --git a/contrib/visualize-alignment/README b/contrib/visualize-alignment/README
index 0009dcf..6c30f94 100644 (file)
--- a/contrib/visualize-alignment/README
+++ b/contrib/visualize-alignment/README
@@ -8,6 +8,12 @@ such as a single write, or groups of operations.  You can examine the
 traces by hand (as text files) or turn them into graphical
 visualizations.
 
+IMPORTANT NOTE: This is not upstream (in qemu) nor integrated into
+libguestfs.  We should probably be using the 'blktrace' command
+instead, or if that is not suitable, get a more reliable and useful
+trace mechanism added to qemu (the current patch is not suitable for
+upstreaming).
+
 The *.qtr files are qemu trace files, produced using the unofficial
 qemu patch in the current directory.