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    SubjectRe: 2.6.24-rc8-rt1: Strange latencies on mpc5200 powerpc - RCU issue?
    Steven Rostedt wrote:
    > On Wed, 2 Jul 2008, Wolfgang Grandegger wrote:
    >> Steven Rostedt wrote:
    >>> On Tue, 1 Jul 2008, Wolfgang Grandegger wrote:
    >>>> I continue this thread because it's still not understood why enabling
    >>>> CONFIG_RCU_TRACE is necessary to get reasonable latencies on the
    >>>> MPC5200. It might also explain, why I get much worse latencies with
    >>> Have you tried turning on ftrace?
    >> Hm, is it available for PowerPC? I have not found yet how to enable it.
    > Hmm, should be. But I need to test it on my PPC box first before I can
    > tell you for sure. If you don't see a way to enable it, perhaps I haven't
    > updated the config options for PPC yet.

    I added HAVE_FTRACE and HAVE_DYNAMIC_FTRACE to "config PPC" but more
    seems to be missing, e.g. arch/powerpc/kernel/ftrace.c. Nevertheless,
    how would I trigger high latency events with ftrace. I there a
    description somewhere?


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