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    SubjectRe: [PATCH][RFC 2/23]: SCST core
    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 :-)


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