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Colocation of definition and code: With the attribute macro I can define the probe where it is used, only making changes to a single file and in a single language. If I used the |
Linux perf does not understand the probes laid down by the usdt crate. This mostly makes sense, as usdt is made by oxidecomputer folks and they mainly target illumos and linux distributions with DTrace available. My assumption is that we end up with the no-action register_probes() call and hence we get no probe information. Not sure why that is but so it is.
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Enable tracing of JavaScript and builtin function calls, GC timings, and Script, Module, eval, and Job execution.
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Enable tracing of JavaScript and builtin function calls, GC timings, and Script, Module, eval, and Job execution.
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USDT tracing is a way for programs to statically define "points of interest" for tracing tools like DTrace, perf, bpftrace, SystemTap, and others to hook into. I've been diving into this world lately with the intention of getting better performance feedback from Nova. I now have a working Linux-based USDT system built forked from Oxide Computer's usdt crate, and this PR is then a showcase of how that can then be utilised.
Examples
Tracing constructor calls: