[ltt-dev] lttv-gui: using the graph to see events

[Alexandre Montplaisir]

On 11-08-27 05:32 AM, Zvi Vered wrote:
> Hello,
>
> Currently I'm using vanilla 2.6.27.35
>
> 1. What patch should I use ? There is no patch for 2.6.27.35

2.6.27 is quite old, and so is the matching LTTng version. If you have 
to stay on that version, then the best bet is probably LTTng 0.72, the 
latest one for 2.6.27.x

Check the compatibility list too, it might also require older versions 
of ltt-control and LTTV.

>
> 2. If I use a patched kernel, can I report events from user space and 
> see them on a graph ?

If you take a *kernel* trace (using lttctl), you will see events coming 
from userspace applications (like system calls) and those will show in 
the control flow view. But if you instrument your own application with 
UST and take a UST trace (with ustctl), those traces do not populate the 
control/resource views in LTTV, yet.

>
> Thanks,
> Zvika.
>
> ----- Original Message ----- From: "Alexandre Montplaisir" 
> <alexandre.montplaisir at polymtl.ca>
> To: "Zvi Vered" <veredz72 at gmail.com>
> Cc: <ltt-dev at lists.casi.polymtl.ca>
> Sent: Saturday, August 27, 2011 4:48
> Subject: Re: [ltt-dev] lttv-gui: using the graph to see events
>
>
>> On 11-08-26 06:06 PM, Zvi Vered wrote:
>>> Hello,
>>>
>>> I'm using ust-0.15.
>>> I ran hello,hello2 contained in tests folder using usttrace.
>>> Then I added the trace to lttv-gui.
>>>
>>> Do you have a test code where I can see events or tracepoints on the 
>>> graph ?
>>>
>>> Till now I managed to see events only in a list at the bottom of the 
>>> gui.
>>>
>>> Thanks,
>>> Zviak.
>>
>> Hi Zviak,
>>
>> This is normal. The state system in LTTV only handles kernel traces 
>> for now. When displaying UST traces, the control flow and resource 
>> views will be empty.
>>
>> There are plans on the mid/long-term roadmap to come up with a 
>> generic way to define "state changes" for UST tracepoints. This will 
>> ultimately allow any application instrumented with UST to display its 
>> own resources and control flow.
>>
>>
>> Regards,
>>
>> -- 
>> Alexandre Montplaisir
>> DORSAL lab,
>> ֹcole Polytechnique de Montrיal
>>
>