A few new SystemTap features that have been eagerly awaited were vetted in Fedora and are likely set to start appearing in upcoming RedHat releases:
- A revamped security model that allows for probing by non root-users, without compromising security. An example of why this is useful is detailed in the linked readme.
- Basic support for user-space probing. A probe can be placed at a location specified by PID and virtual address, and the normal range of tapset features are available for user-space probes.
crashutility (for analyzing dump data) can use the
staplogextension to retrieve the SystemTap relay buffer from a kernel dump image. Seems like a useful feature when tracking a bug that causes a kernel crash.
If you are interested in more information, I previously wrote about a real-world use of SystemTap, and about how to use kernel markers in SystemTap. Of course, there are lots of other sample scripts on the SystemTap wiki.