----- On Apr 20, 2021, at 8:55 AM, rostedt rost...@goodmis.org wrote: [...] > > Would adding automatic module parameters be an issue? That is, you can add > in the insmod command line a parameter that will enable tracepoints. We > could have a way to even see them from the modinfo. I think I had that > working once, and it wasn't really that hard to do.
There is one thing we should consider here in terms of namespacing: those module command line parameters should be specific to each tracer (e.g. ftrace, perf, ebpf). LTTng for instance already tackles early module load tracing in a different way: users can enable instrumentation of yet-to-be loaded kernel modules. So it would not make sense in that scheme to have module load parameters. It's a different trade-off in terms of error reporting though: for instance, LTTng won't report an error if a user does a typo when entering an event name. So I think those command line parameters should be tracer-specific, do you agree ? Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
