[ltt-dev] LTT for ARM

[Mathieu Desnoyers]

* Jason Wessel (jason.wessel at windriver.com) wrote:
> On 03/02/2011 07:08 AM, Ali Günhan Akyürek wrote:
> > Hi Mathieu,
> >
> > Thanks, i'm looking at patchset.
> >
> > One more question: As far as I read documentation, UST is not supported on ARM.
> 
> UST is supported on ARM now if you are using the development branch.
> The docs are not up to date.  Support for ARM was merged in the last
> two weeks.

By the way, there is currently no vDSO clock_gettime() exporting the
LTTng trace clock for the ARM architecture. Therefore, we have to hit
the kernel at every tracing site to read time. Someone should probably
think of addressing that eventually in the LTTng kernel tree, at least
for the most common architectures (e.g. omap) that provide a ccnt
register that we can set so it can be read from user-space.

Thanks,

Mathieu

> 
> Please send bug reports to the list if you encounter problems on ARM.
> 
> Cheers,
> Jason.

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