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Re: syscall tracing overheads: utrace vs. kprobes
> Certainly, in general. But in this specific test, only the under-test
> system calls occurred in essnetially the whole system, so the overhead
> measurements were in a way the bare minimums imposed by the kprobes
> vs. utrace callback infrastructure itself.
Yes. That's why I meant to explain how these numbers are true but not
necessarily the numbers that matter.
> > In real situations [...] the distribution of overheads will be
> > quite different.
>
> Or rather, the basic overhead quanta measured above may be multiplied
> along several different axes.
Yes.