SystemTap is a tracing and probing tool that allows users to monitor the activities of the entire system without needing to instrument, recompile, install, and reboot. It is programmable with a custom scripting language, which gives it expressiveness (to trace, filter, and analyze) and reach (to look into the running kernel and applications).
SystemTap can monitor various types of events, such as function calls within the kernel or applications, timers, tracepoints, performance counters, and so on. Some included example scripts produce output similar to
iostat, others include pretty-printed function callgraph traces or tools for working around security bugs.
Red Hat Developer Toolset is distributed with SystemTap 2.9. This version is more recent than the version included in the previous release of Red Hat Developer Toolset and provides numerous bug fixes and enhancements.
Table 11.1. Tools Distributed with SystemTap for Red Hat Developer Toolset
| Name || Description |
| Translates probing instructions into C code, builds a kernel module, and loads it into a running Linux kernel. |
| The Dyninst backend for SystemTap. |
| Loads, unloads, attaches to, and detaches from kernel modules built with the |
| Serves as a remote shell for SystemTap. |
| Determines and—if possible—downloads the kernel information packages that are required to run SystemTap. |
| Merges per-CPU files. This script is automatically executed when the |
stap utility is executed with the
-b command line option.
| Gathers important information about the system for the purpose of reporting a bug in SystemTap. |
| A compile server, which listens for requests from |
11.1. Installing SystemTap
The Red Hat Developer Toolset version of SystemTap is available for both Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7, but some new features are only offered by the Red Hat Developer Toolset version of SystemTap for Red Hat Enterprise Linux 7.
In order to place instrumentation into the Linux kernel, SystemTap may also require installation of additional packages with debugging information. To determine which packages to install, run the
stap-prep utility as follows:
scl enable devtoolset-4 'stap-prep'