feat: kernel tracing support
#191
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Until now, kernel debugging was been limited to structured logging through
logand while that is great and more than sufficient for release-build logging, for debugging purposes and especially for performance work we need something more sophisticated.To this end #185 introduced the concept time & initial support for monotonic and wall-time clocks into the kernel, so that we can actually measure things.
This PR lays the groundwork for more sophisticated debugging by bringing
tracingsupport to the kernel.tracingis a standard Rust crate that - in addition to events thatlogdeals with - knows about spans which represent spans of execution between two points in time. Since tracing has been built with asynchronous Rust in mind, spans can also be paused and resumed an arbitrary amount of time (calledenteringandexiting) which is convenient for tracking execution time in all kinds of multitasking setups.tracingalso features a host of convenient macros to emit these spans.