[ltt-dev] Followup: UST support for PowerPC

[Mathieu Desnoyers]

* soumyakanti chakraborty (soumyakanti.chakraborty at gmail.com) wrote:
> On Sat, Apr 10, 2010 at 12:32 PM, Naren <tracemein at gmail.com> wrote:
> 
> > Hi,
> >
> > In the UST manual Link<http://lttng.org/files/ust/manual/ust.html#Supported-platforms>,
> > its mentioned that *"**UST can currently trace applications running on
> > Linux, on the x86-32 and x86-64 architectures**". *I am interested in
> > using UST on applications running on PowerPC platforms, especially, ppc32.
> > Is it still the case that it is not supported in ppc?
> >
> > Hello Naren
> 
> As of now UST doesnt support ppc architectures.It is needed to be ported to
> it, but according to Pierre its is easy to do it as presently userspace-rcu
> atomic ops supports ppc architecture.

Yep. One should have a look at the kernel LTTng
arch/powerpc/include/asm/trace-clock.h, and port the trace clock to UST.
That imply reimplementing Linux get_tb() and get_tbl().

This work should be relatively straightforward for powerpc32/64, but can
be much more difficult for other architectures, possibly requiring vDSO
support.

Thanks,

Mathieu

> 
> 
> 
> > Regards,
> >
> Soumya

> _______________________________________________
> ltt-dev mailing list
> ltt-dev at lists.casi.polymtl.ca
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev


-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com