NEWS: add blurbs re "stap -t" skippage and shared library probing

1 files changed, 15 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 18c1243d..eecee974 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,20 @@
 * What's new
 
+- A serious problem associated with user-space probing in shared libraries
+  was corrected, making it now possible to experiment with probe shared
+  libraries.  Assuming dwarf debugging information is installed, use this
+  twist on the normal syntax:
+
+    probe process("/lib64/libc-2.8.so").function("....") { ... }
+
+  This would probe all threads that call into that library.  Running
+  "stap -c CMD" or "stap -x PID" naturally restricts this to the target
+  command+descendants only.
+
+- For scripts that sometimes terminate with excessive "skipped" probes,
+  rerunning the script with "-t" (timing) will print more details about
+  the skippage reasons.
+
 - Symbol tables and unwind (backtracing) data support were formerly
   compiled in for all probed modules as identified by the script
   (kernel; module("name"); process("file")) plus those listed by the