Philippe Gerum wrote:
> 
> As promised, the I-pipe tracer has been ported to ppc. People working on 
> this architecture are invited to give it a try, it's a great tool to 
> find out where the cycles are actually going.
> 
> Just apply the tracer patch on top of the Adeos patch bearing the same 
> revision number, and select the feature from the kernel configuration. 
> If you happen to have some issue while booting the instrumented kernel 
> on embedded setups (e.g. freeze after kernel decompression), try 
> reducing the size of the trace log (CONFIG_IPIPE_TRACE_SHIFT).
> 
> http://download.gna.org/adeos/patches/v2.6/ppc/tracer/

I gave it a try on a rather low-end PowerPC Walnut board (AMCC PowerPC 
405GP, Rev. E at 200 MHz, 16 kB I-Cache 8 kB D-Cache). A nice tool, 
indeed, and it works fine. I have attached the results from running the 
Xenomai latency "-t0" test with some load showing latencies up to 140 
us. The trace seems not to show any obvious problems, I think.

Thanks.

Wolfgang.