1.3. Limitations of SystemTap

The current iteration of SystemTap allows for a multitude of options when probing kernel-space events for a wide range of kernels. However, SystemTap's ability to probe user-space events depends on kernel support (the Utrace mechanism) that is not available in many kernels. As a consequence, only some kernel versions support user-space probing.
At present, the developmental efforts of the SystemTap community are geared towards improving SystemTap's user-space probing capabilities.