kernel instruction level tracing

[joyhaa]

i'm trying to analyze netfiltering and routing
workload inside the kernel for PowerPC(a typical
kernel 'application', and I can not figure out how to
do the workload analysis in use space for them), is
there a way to trace all the instruction flow(e.g. a
packet coming-in--> going-out) so I can use the result
to further analyze things like cache hit/miss,
latency,drop rate,etc? I'd like to collect the raw
instruction flow in simulation state(non realtime).

LTT(Linux Trace Toolkit) is a good tool, but I want
more detailing tracing info. I tried UML, it doesn't
work well on PowerPC so far.

Is it possible at all?

Thanks

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