[ltt-dev] Using LTTng on DA8xx Target

[Pierre-Marc Fournier]

saumya agarwal wrote:
> Thanks Marc, this info should get me started.
> 
> My host linux machine has a different kernel version (2.6.9), so do I
> need LTTV compatible with host or target?

You need a LTTV compatible with the target.

> In DA8xx kernel sources, I see a folder named LTT which has some
> source files like ltt-control.c, ltt-core.c etc, so does that mean
> that LTT control tools are already available in the kernel?

This means ltt patches have already been applied to the kernel. To see
if you have ltt-control, check for the following executables:
/usr/bin/lttd or /usr/local/bin/lttd
/usr/bin/lttctl or /usr/local/bin/lttctl

pmf

> 
> --Saumya
> 
> 
> On 11/12/08, Pierre-Marc Fournier <pierre-marc.fournier at polymtl.ca> wrote:
>> Hello Saumya,
>>
>> saumya agarwal wrote:
>>> I am using a DA8xx Primus EVM and I want to use LTTng to trace the
>>> system. The  kernel supports LTTng.
>>> This is the first time I'll am working on it.
>>>
>>> I downloaded TraceToolkit-0.9.5 and untared it.
>>> The patched I am getting are:
>>> patch-ltt-linux-2.4.16-rthal5f-020415-1.14
>>> patch-ltt-linux-2.4.16-s390-020422-1.14
>>> patch-ltt-linux-2.4.16-vanilla-020415-1.14
>>> patch-ltt-linux-2.5.7-vanilla-020415-1.14
>>> patch-ltt-rtai-24.1.8-020317-1.14
>>>
>> Hmm, I don't know where you got this patch, but it is several years old.
>> Please see the site http://ltt.polymtl.ca
>> Have a look at the Compatibility list ("LTTng+LTTV versions
>> compatibility" link) to see what you need for a 2.6.18 kernel. You
>> probably need LTTng 0.6.41, ltt-control 0.30 and LTTV (the viewer)
>> 0.8.72. You will also find the quickstart guide there which will help
>> get you started.
>>
>> Note that since 2.6.18 is an old kernel. A lot of things changed since
>> that time and the quickstart guide that is on the site now will not be
>> in sync with this old version. I would recommend fetching the old guide
>> from the svn repository.
>>
>>> But the linux kernel version for DA8xx is 2.6.18.
>>> So can I use any of these patches?
>> No, you need a much newer version of LTTng that was designed for 2.6.18.
>>
>>> One more doubt I had was, that we use this tool from host or on
>>> target? Do I need a linux host machine, apply patches to its kernel,
>>> and reboot it and then start using it OR I need to apply patches to my
>>> DA8xx kernel and then start tracing on target itself?
>> You install the patches on the target kernel. You also need the
>> ltt-control tools on the target to control the tracing. You need to have
>> enough disk space on the target to record the trace. Work on streaming
>> is under way. Once you have the trace, you transfer it to the host and
>> inspect it with LTTV.
>>
>>> I am kind of confused about its usage.
>>> Could any one help me out with the exact procedure for using LTTng and
>>> patches version (website) from where I can get required packages?
>> Look at ltt.polymtl.ca and the quickstart guide.
>>
>> pmf
>>