Re: Unreliable USB3 with NEC uPD720200 and Delock Cardreader

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On Thu, Oct 25, 2012 at 5:31 AM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:

>> I don't know how to use those.  Is there a doc somewhere?
>
> I'm not sure, but let's ask the developer who added them.
>
> Lei, do you have any doc describing how to use those tracepoints?

Hi Bjorn Helgaas,

Firstly, please enable these tracepoints via below

          echo 1 > /sys/kernel/debug/tracing/events/rpm/enable

then store the trace event result by below once you make sure your interested
events are completed:

          echo 0 > /sys/kernel/debug/tracing/events/rpm/enable
          cp /sys/kernel/debug/tracing/trace /media/ram/rpm-trace

For the format of the captured trace log(rpm-trace), please see

                include/trace/events/rpm.h

which is just a replacement of previous printk and add some extra fields
into that.  If you still don't understand the format, please post the
result onto list, and I think many guys here may help you out.

Hope the above can help you.


Thanks,
--
Ming Lei
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