For further information about systemtap, several sources are available.
There are man pages:
|stap||systemtap program usage, language summary|
|stappaths||your systemtap installation paths|
|stapprobes||probes / probe aliases provided by built-in tapsets|
|stapex||a few basic example scripts|
|tapset::*||summaries of the probes and functions in each tapset|
|probe::*||detailed descriptions of each probe|
|function::*||detailed descriptions of each function|
There is much more documentation and sample scripts included. You may find them under /usr/share/doc/systemtap*/.
Then, there is the source code itself. Since systemtap is free software, you should have available the entire source code. The source files in the tapset/ directory are also packaged along with the systemtap binary. Since systemtap reads these files rather than their documentation, they are the most reliable way to see what’s inside all the tapsets. Use the -v (verbose) command line option, several times if you like, to show inner workings.
Finally, there is the project web site (http://sourceware.org/systemtap/) with several articles, an archived public mailing list for users and developers (email@example.com), IRC channels, and a live GIT source repository. Come join us!