Thank you very much for your reply. You pointed to me to the right direction. Andy On Mon, Mar 30, 2015 at 2:49 PM, Gustavo Bittencourt <gbitten@xxxxxxxxx> wrote: > I think you can use FTRACE (http://lwn.net/Articles/365835/) and set > function_graph as the tracer. To filter the output, you must enable > CONFIG_DYNAMIC_FTRACE and set which function should be traced. > > On Sun, Mar 29, 2015 at 5:16 PM, Andy Ng <andreas2025@xxxxxxxxx> wrote: >> Hello, >> >> I am using an RT kernel and in my driver there is an atomic code >> path that just makes some critical I/O operations. I would like to >> trigger a system function trace when kernel enters into a specific >> function in my driver and stop the system trace at the end of the >> function. I would like to identify time execution latencies for a >> specific code path. I am using Cortex A9 and I have perf and PMU up >> and running, but still it is not clear to me how to retrieve the >> traces with those latencies in my code path. >> >> Any ideas how to trace/measure that will be very much appreciated. >> >> Best regards, >> Andy >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
