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    Subject[PATCH 0/5][RFC] [RFC] function profiler
    The following patches are RFC, and to discuss is this work would be
    useful.

    This patch series adds a function profiler hook to the function tracer
    and function graph tracer. That is, it uses the mcount calls to track the
    functions being called. Now with the function graph tracer it also
    keeps track of the times the functions have been executing.

    Note, this is similar to oprofile, but is not a sampling approach, but
    a true recorder. Of course, by recording every function the overhead
    compared to oprofile is higher. With the use of dynamic ftrace, you could
    just trace certain functions, or just a certain module. The flexibility
    is a bit greater with this profiling.

    The last patch adds another feature to the function graph. It gives
    the ability to only trace the amount of time inside a function and
    not the amount spent in sub functions that are also recorded. That is,
    if A calls B, you can decide if the time spent in A should include the
    time spent in B. This is an option added to trace_options.

    Again, this is all RFC, but if there is any interest in having this
    feature, prehaps we should include it.

    -- Steve


    The following patches are in:

    git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git

    branch: rfc/tip/tracing/function-profiler


    Steven Rostedt (5):
    tracing: add function profiler
    tracing: move function profiler data out of function struct
    tracing: adding function timings to function profiler
    tracing: make the function profiler per cpu
    function-graph: add option to calculate graph time or not

    ----
    include/linux/ftrace.h | 3 +-
    kernel/trace/Kconfig | 15 +
    kernel/trace/ftrace.c | 558 +++++++++++++++++++++++++++++++++-
    kernel/trace/trace.c | 15 +-
    kernel/trace/trace.h | 4 +-
    kernel/trace/trace_functions_graph.c | 25 ++-
    kernel/trace/trace_output.c | 10 +
    kernel/trace/trace_output.h | 2 +
    8 files changed, 608 insertions(+), 24 deletions(-)
    --


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