Yeah, ftrace is great and the trace-cmd frontend too. Another swiss-army-knife type of a tool, like perf... and is also available in older kernels. One thing t

Yeah, ftrace is great and the trace-cmd frontend too. Another swiss-army-knife type of a tool, like perf... and is also available in older kernels. One thing that I had missed was function call argument tracing, but looks like ftrace will soon have it too (update: it's actually available on modern kernels already, look for CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS kernel config option). https://lwn.net/Articles/1003386/ https://lwn.net/Articles/1003386/ https://lpc.events/event/11/contributions/1106/attachments/761/1431/lpc-2021-ftrace-args.pdf https://lpc.events/event/11/contributions/1106/attachments/7...