Tracing power_end on kernel 2.6.32.8
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From: Robert Schöne on 15 Feb 2010 06:20 Hi, I have a question regarding the event "power/power_end". For the standard linux kernel (2.6.32.8), it's just not reported - neither for the /sys/kernel/debug/tracing nor for the sys_perf_open approach. System: Intel Core 2 Quad, Kernel 2.6.32.8, for sys_perf_open:always using sampling counters, (Kernel 2.6.33-rcX should show the same behavior) After finding "my" c-state procedure in arch/x86/kernel/process.c (which was "static void mwait_idle(void)" btw), I added a trace_power_end call on the correct line: .... else local_irq_enable(); } else .... -> .... else local_irq_enable(); trace_power_end(0); } else .... Now the event was reported on /sys/kernel/debug/tracing, but still not for sys_perf_open. Then I had the idea, that trace_power_end's argument should be the same as the 2nd argument of the previous power_start. That worked. However, things to be done are: add trace_power_end's to some process.c's procedures. Bye Robert -- Robert Schoene Technische Universitaet Dresden Zentrum fuer Informationsdienste und Hochleistungsrechnen 01062 Dresden Tel.: (0351) 463-42483, Fax: (0351) 463-37773 E-Mail: Robert.Schoene(a)tu-dresden.de -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |