OmniOS Motivation and Design / Theo lays out the case for OmniOS at Usenix LISA ‘12.
OmniOS is a distribution of illumos, and as such, many aspects of the system’s function are derived from the illumos core, which has its own documentation. Additionally, technologies like ZFS and DTrace, which have been ported to non-illumos operating systems, have their own communities of wisdom from which we all benefit.
USDT probes are Userland Statically-Defined Tracing probes added to application or language runtimes that provide additional probes beyond what can be obtained from dynamic tracing of library and system calls. This allows for deeper introspection and tracing of a broader set of operations within the runtime.
DTrace probes are available for many common applications and languages, including: