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    SubjectRe: Ftrace doesn't work anymore on latest tip
    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.
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