On Wed, 7 Feb 2024 at 22:37, Dave Chinner <david@xxxxxxxxxxxxx> wrote: > ftrace using the function_graph tracer will emit the return values > of the functions if you use it with the 'funcgraph-retval' option. > > Seems like a solved problem? Except a) this seems exceedingly difficult to set up for non-developers, which is often where this is needed. Even strace is pretty verbose and the generated output too big, let alone all function calls across the whole system. b) can only point to the function was generated. But the same error is often generated for several different reasons within the same function and the return value doesn't help there. I think a) is the critical one, and possibly the ftrace infrastructure could be used for something more friendly that just pointed to the function where the error was generated without having to go through hoops. Thanks, Miklos
