@jpsamaroo might be a cool example for BPFnative.jl?

Exciting! Thanks Valentin! :)

Yeah agreed, thanks for picking this up again, Valentin!!

These are working on Linux (musl) with bpftrace and BPFnative!

Any chance we could also get probes on task switching? This could be a good, temporary alternative to #39994, where hook execution can be disabled via Preferences or some other mechanism per-package.

For Julia code side probes there is https://github.com/JuliaPerf/UProbes.jl, but that is hamstrung by the lack of JIT support in tools bpftrace/bpftrace#425

Any chance we could also get probes on task switching

I think adding probes on task switching shouldn't be too hard.

One thing I haven't tested in a while is ustack support e.g. if we get a correctly demangled stacktraces inside the probe.

This could be a good, temporary alternative to #39994, where hook execution can be disabled via Preferences or some other mechanism per-package.

Uhm... I don't quite understand what you are thinking about, but let's not go down the path of using eBPF programs to modify user-space on task-switches.

Uhm... I don't quite understand what you are thinking about, but let's not go down the path of using eBPF programs to modify user-space on task-switches.

I'm thinking of using it to collect metrics about executing tasks, like being able to calculate the actual CPU execution time of a task (since clock_gettimeis per-thread, we need to exclude other concurrently executing tasks).

Wanna give it a go to try adding probes for that?

By the way, building from master with WITH_DTRACE=1 fails for me on macOS with the error

 dtrace -h -s /private/tmp/julia-20210907-69372-bfig8y/src/uprobes.d -o uprobes.h.gen
dtrace: failed to compile script /private/tmp/julia-20210907-69372-bfig8y/src/uprobes.d: line 5: syntax error near "probe"
make[2]: *** [uprobes.h.gen] Error 1

I guess uprobes.d needs to be slightly different for macOS dtrace. Apologies for digging up this PR to post this, but I wasn't sure if this was worth tracking in a separate issue. Happy to open a new one if it is.