[ltt-dev] [Lttng] Need help in running the Lttng on ARMv7 hardware with linux 2.6.35.7 kernel

[Mathieu Desnoyers]

* Murali S R (sr.muralidhar at gmail.com) wrote:
> On Thu, Apr 28, 2011 at 6:01 PM, Mathieu Desnoyers <
> compudj at krystal.dyndns.org> wrote:
> 
> > * Murali S R (sr.muralidhar at gmail.com) wrote:
> > > Hi All,
> > >
> > > I am trying to run lttng on ARMv7 target with the following
> > > Kernel --- linux 2.6.35.7 kernel and
> > > Lttng Kernel Patch --- patch-2.6.35.7-lttng-0.232.tar.bz2
> > > Modules --- lttng-modules-0.19.1.tar.bz2
> > > Control Modules --- ltt-control-0.88-09242010.tar.gz
> > >
> > > Whenever i enable the statedump ( by loading the ltt-statedump module)
> > and
> > > run lttctl tracing ( lttctl -C -w /tmp/trace trace ),
> > > immediately a log "LTT Statedump end" is thrown.
> > >
> > > After which i can still see some trace data being accumulated in the
> > trace
> > > path (/tmp/trace).
> > >
> > > Now if i close the tracing (lttctl -D trace) & try to view the trace
> > using
> > > lttv-gui, It gets terminated with segmentation fault error.
> >
> > What version of LTTV are you using ? Does it match your lttng-modules
> > version as specified in the compatibility list on the lttng.org website
> > download section ?
> >
> > Thanks,
> >
> > Mathieu
> >
> > >
> > > Can anyone help in letting me know where i am doing wrong.
> > > Also, is there any means to trace only a particular module instead of
> > entire
> > > kernel.
> > >
> > > Thanks in advance :)
> > >
> > > --
> > > Regards,
> > > Murali
> >
> > > _______________________________________________
> > > 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
> >
> 
> 
> Hi Mathieu,
> 
> Thanks for the reply ... am using lttv version : 0.12.36, which is
> compatible according to the compatibility list.
> Also, one more thing what i observed is if i do not enable the statedump, i
> am able to get the trace dump, which i can view in lttv-gui.
> 
> But that doesnt give any details on the process name ...
> 
> Is there anything i am missing ??

Probably that the statedump module was buggy in that lttng-modules
version. You might want to try a newer release.

Thanks,

Mathieu

> 
> I followed the foll procedure :
> 1. downloaded and patched the lttng 0.232 version on 2.6.35.7
> 2. built the kernel and lttng modules and the ltt-control modules.
> 3. installed the modules on target.
> 4. then loaded all the required modules
> 5. started ltt-armall
> 6. exported the lttd path
> 7. then executed lttctl to create trace
> 8. after collecting the trace (without statedump) from the target onto my
> pc,
> i am able to view that trace in lttv on my computer.
> 
> -- 
> Regards,
> Murali

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