Messages in this thread | | | Date | Tue, 28 Oct 2008 10:02:09 +0100 | From | "Frédéric Weisbecker" <> | Subject | Re: Ftrace doesn't work anymore on latest tip |
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2008/10/28 Frédéric Weisbecker <fweisbec@gmail.com>: > 2008/10/28 Steven Rostedt <rostedt@goodmis.org>: >> >> On Tue, 28 Oct 2008, Fr?d?ric Weisbecker wrote: >> >>> Hi, >>> >>> I tried to launch the function tracer with the latest -tip. >>> With DYNAMIC_FTRACE (I just tried one time), I set "function" to >>> current_trace and it blocks during writing. I can't >>> even switch to another console. >>> Without DYNAMIC_FTRACE I can set the tracer to function but it doesn't >>> produce any trace, even on trace or tracing_pipe. >>> >>> My config is in attachment. >>> I will try some revert...or some other tracers. >>> >> >> >> You might want to update your config (make oldconfig?) The latest tip has >> FUNCTION_TRACER instead of FTRACE. >> >> Also, the config you sent me, does not even have FTRACE on :-/ >> >> CONFIG_HAVE_FTRACE=y >> CONFIG_HAVE_DYNAMIC_FTRACE=y >> CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y >> CONFIG_TRACER_MAX_TRACE=y >> CONFIG_RING_BUFFER=y >> CONFIG_TRACING=y >> # CONFIG_FTRACE is not set >> # CONFIG_IRQSOFF_TRACER is not set >> # CONFIG_PREEMPT_TRACER is not set >> # CONFIG_SYSPROF_TRACER is not set >> CONFIG_SCHED_TRACER=y >> CONFIG_CONTEXT_SWITCH_TRACER=y > > Sorry I sent a config for the mainline. > This new one is the right. >
One other point: I can't assign the sched_switch tracer. echo sched_switch > current_tracer returns -EINVAL with CONFIG_DYNAMIC_FTRACE disabled (didn't tested with enabled).
I will check that more deeper when I'll have more time. -- 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/
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