Ask HN: Resources on the Design of DTrace?

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Can anyone recommend any useful talks, slides, documents, clones, etc.. of DTrace that would help me get up to speed with how DTrace does what it does so efficiently?

I plan to learn from reading the open source code, but I’d like to at least have some idea of its internal design, before I do.

Apart from a talk by Arun Thomas, can anyone recommend anything? Thanks.