Messages in this thread | | | Date | Wed, 05 May 2010 08:34:17 +0200 | From | Ronny Tschüter <> | Subject | Re: Tracing of power:power_start events doesn't work |
| |
On Wed 2010-05-05 02:31, Steven Rostedt wrote: > On Mon, 2010-05-03 at 15:19 +0200, Ronny Tschüter wrote: > >> Hello, >> >> i use kernel version 2.6.33.2 (x86-64, Core 2 Duo) and the perf events >> to track frequency and c states of my cpu. But if i want to trace >> power:power_start events, it does not work. After typing >> >> echo "power:power_start" | sudo tee set_event >> >> on the console, the trace doesn't contain such events. >> power:power_frequency and power:power_end events are reported correctly >> by the system. I read in the mailing list that Robert Schoene had a >> similiar problem, but with power:power_end events. Is there a known bug >> regarding to trace_power_start methods in process.c? >> > Is this for perf or ftrace? I'm assuming you did this from the debugfs > tracing directory. The set_event file is for ftrace not perf. > It is for perf - i'm interested in event tracing. I used the event tracing system like it is described in Documentation/trace/events.txt. In addition i wrote a program which uses syscall(__NR_perf_counter_open, ... ) to trace power events. But the result is the same - power:power_end events are reported, power:power_start events not.
Bye Ronny -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |