Re: LTTng for SH architecture

* Giuseppe Cavallaro ([email protected]) wrote:
> Thanks Mathieu,
> so I wonder if it's worth while continuing my work with the LTTng
> 0.6.0version on the kernel
> 2.6.17.
> Indeed, looking at the latest patches (0.9.5) for the kernel 2.6.21 I've
> seen that many pieces, of the LTT code, have been changed (for example, I've
> found no LTT_FACILITY_CHECKSUM macro).
> Applying the LTTng 0.9.5 patches to the 2.6.17 kernel, it's likely I'd
> verify too many things (relay FS, common structures) etc. So I'd spend a
> little while.
> What do you think?
> 

Well, in the long run, the best thing would be to work on a recent
kernel to do the initial SH4 port, so it could be added to the current
LTTng patches, and then do a backport of what you need to 2.6.17. You
can refer to a few emails in the ltt-dev ML about what pieces must be
taken from the recent kernel to the older ones for a correct backport.

The advantage of this approach is that your work will afterward be
maintained with the rest of LTTng.

Mathieu

> Giuseppe
> 
> On 14/06/07, Mathieu Desnoyers <[email protected]> wrote:
> >
> >* 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
> >
> >> _______________________________________________
> >> Ltt-dev mailing list
> >> [email protected]
> >> http://listserv.shafik.org/mailman/listinfo/ltt-dev
> >
> >
> >--
> >Mathieu Desnoyers
> >Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
> >OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE
> >9A68
> >

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-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68