On 11/03/2014 09:14 PM, Steven Rostedt wrote: > On Mon, 3 Nov 2014 20:45:25 -0500 > Peter Hurley <[email protected]> wrote: > >> When using the function or function_graph tracers from the command >> line, certain command line options have limitations. >> >> Document that only kernel built-in functions can be filtered via >> ftrace_filter= or ftrace_graph_filter=. Also document that tracer- >> specific options cannot be set on the command line via trace_options. > > It's not just a command line limitation. The command line behaves > exactly like set_ftrace_filter does. That is, it only affects the > functions that are loaded when the filter is modified. It never updates > functions that will be loaded when modules are. > > Adding this documentation makes it seem that set_ftrace_filter has the > ability to update functions that were not loaded yet. This is not true. > The command line filtering behaves exactly like set_ftrace_filter does. > It only enables the functions that are loaded at the time the function > is set. Which was at boot up, and it just happens to be only built in > functions at that time.
Ah, ok. I'll clarify those two lines and add to the documentation in Documentation/trace/ftrace.txt -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
