Add a note about SystemTap vs DTrace spelling of probe names.

diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index f5dce009fff35e18641a832912415bd6c0c3409d..7bd21a74b427d773208aa4cbda0aad6c38ea5049 100644 (file)
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -1,4 +1,4 @@
-
+
 
 
  Monitoring Database Activity
@@ -1568,6 +1568,17 @@ Commit                                         70
 Total time (ns)                        2312105013
 
   
+
+  
+   
+    SystemTap uses a different notation for trace scripts than DTrace does,
+    even though the underlying trace points are compatible.  One point worth
+    noting is that at this writing, SystemTap scripts must reference probe
+    names using double underlines in place of hyphens.  This is expected to
+    be fixed in future SystemTap releases.
+   
+  
+
   
    You should remember that DTrace scripts need to be carefully written and
    debugged, otherwise the trace information collected might
@@ -1576,6 +1587,7 @@ Total time (ns)                        2312105013
    discussing information found using dynamic tracing, be sure to enclose
    the script used to allow that too to be checked and discussed.
   
+
   
    More example scripts can be found in the PgFoundry
    dtrace project.