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
2.6.25.8-rt7.
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?
Wolfgang.
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