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    SubjectRe: [PATCH][RFC 2/23]: SCST core
    2008/12/13 Frédéric Weisbecker <fweisbec@gmail.com>:
    > 2008/12/13 Arnaldo Carvalho de Melo <acme@redhat.com>:
    >> Steven, is it possible to trigger tracing for any function when a
    >> function in the list set up by the user is running and then stop tracing
    >> when it exits?
    >>
    >> - Arnaldo
    >>
    >
    > Hi Arnaldo,
    >
    > Yes it's possible with ftrace, by using the function graph tracer ( an
    > ftrace extension that adds the tracing on return).
    >
    > To enable it just do:
    > echo function_graph > /debugfs/tracing/current_tracer
    >
    > And to trace by choosing a particular function as the root of the call
    > stack, just do the things
    > explained on this patch:
    > http://git.kernel.org/?p=linux/kernel/git/mingo/linux-2.6-sched-devel.git;a=commit;h=ea4e2bc4d9f7370e57a343ccb5e7c0ad3222ec3c
    >
    > And the tracing will finish after this function returns :-)
    >

    I forgot to say that add-on is not yet included on 2.6.28
    This will be available for 2.6.29.
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