[lttng-dev] babeltrace

[Jessica Foest]

i work only on kernel space event .


2014-05-08 17:10 GMT-04:00 Jessica Foest <jessica.foest at gmail.com>:

> Thanks for your detailed responses :)
> Actually i will begin by taking my own trace that i will configure it in
> advance ( same event type , and i will add the different event context that
> i need ) .
> It's my first time to develop with python and i don't really know the
> architecture of babeltrace , So can you help me and tell me how to proceed
> to filter my data from CTF to the output Format that i will choose ?
>
>
> 2014-05-08 11:53 GMT-04:00 Alexandre Montplaisir <alexmonthy at voxpopuli.im>
> :
>
>
>>  To avoid doing a complete first pass of the trace, you can just
>>> iterate on the event types as described in the metadata, and take note
>>> of all the possible field you can find in the trace. Then, during your
>>> only pass, you already know all your "columns".
>>>
>>
>> That's true. Although right now TMF doesn't have an API to ask a trace
>> "give me all the event types you have", other than just reading the trace ;)
>>
>> wrt CTF, it's possible to have events in the metadata that don't actually
>> show up in the trace. But that's not really a problem, at worst you'd end
>> up with empty columns.
>>
>
>
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