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iopsystems / rezolus

Systems performance telemetry
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getaddrinfo/gethostbyname call latency sampler #296

Open l2dy opened 4 months ago

l2dy commented 4 months ago

Reference: https://github.com/iovisor/bcc/blob/72dbe044395ccffd5249ed1f6c84a5fa4bd21be3/libbpf-tools/gethostlatency.bpf.c

brayniac commented 1 week ago

@l2dy - for this one, since this sampler is based around uprobes and not kprobes, I'm curious what you envisioned for this sampler. We'd need to attach the uprobes to each process on the system or have some mechanism for specifying and attaching to some group of processes.

Let me know if you had thoughts on this. Otherwise, I'm leaning towards closing this out.

l2dy commented 1 week ago

What I envisioned was that the uprobe is attached to the system's libc library, thereby probing all processes using it.

This method has its flaws like not working for statically linked binaries, so it's fine to close this if you consider it inappropriate.