Re: LTTng for SH architecture

* Giuseppe Cavallaro ([email protected]) wrote:
> Hi All,
> I'd like to use LTTng on my kernel 2.6.17 (SH4 architecture).
> Following the compatibility table published on the web, I've applied the
> LTTng 0.6.0 patches on my kernel.
> So I've started porting LTT on the SH4 but I've met some problems because
> I'm not familiar with LTTng internals.
> Looking at the new LTTng 0.9.5 version (for the kernel 2.6.21) and I've seen
> there is a "first porting" on SH.
> Where can I get more information about the LTTng internals?
> Welcome advice.
> 

Hi Giuseppe,

See the Documentation sectino of the ltt.polymtl.ca website.

I recommend that you look at the "lttng instrumentation" patches for
each architectures. You'll find principally that include/asm-$ARCH/ltt.h
hold the timestamping mechanism for each architecture (does SH4 have a
64 or 32 bits timestamp counter ? (get_cycles()))

You will also find various instrumentation points that are architecture
specific that must be ported to SH4.

I guess looking into other architecture's patches is the best way for
you to learn how to do this port.

If you run into problem please tell us. Also, it would be useful to have
this port for the LTTng head so it can be integrated in the next
releases.

Thanks,

Mathieu

> Giuseppe

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-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
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