[ltt-dev] LTT satus

[Mathieu Desnoyers]

Hi,

Facilities are gone long ago. They used a XML description for events
which turned into C code using genevent, a C code generator. It was
rather hellish to keep in sync the kernel code with the XML
descriptions.

The markers are an in-kernel API (see include/linux/marker.h and
Documentation/markers.txt) which lets you describe your events in the C
code. The typing is expressed using a format string. It's automatically
saved in the trace at trace start/module load, so you don't have to take
care of such details by yourself : the meta information about events is
automatically exported through the trace.

Mathieu

* barbalace at igi.cnr.it (barbalace at igi.cnr.it) wrote:
> Dear LTT team,
> I'm involved in the activity of using LTTng to trace RTAI. RTAI has an old 
> support of LTT but this is a don't care issue. The problem is that I've not 
> a clear idea of how LTTng work. My basic question is: what is the 
> difference between Facilities and Markers? Are both still in use?
> I'm currently work with probably not a brand new version of LTTng: the last 
> one that patch linux kernel 2.6.19...
>
> Thanks a lot
>
> - Antonio Barbalace
>
> Istituto Gas Ionizzati del CNR
> Consorzio RFX - Associazione EURATOM/ENEA sulla Fusione
> Corso Stati Uniti 4, 35127 Padova - Italy
> mailto:barbalace at igi.cnr.it, http://www.igi.cnr.it
>
>
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-- 
Mathieu Desnoyers
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