[ltt-dev] migrating from lttctl.40 to lttctl.47

[Laurent Chavey]

Great news.
Since I have machines running different version of the kernel, this requires
me to have a version of lttctl that is "compatible" across the
different kernel versions
(that is why I have lttctl version 40 and 47).
How much is the control interface changing between version of lttng ?

(from the simple diff, I did not see anything major between the two
versions listed
above)

On Mon, Jul 14, 2008 at 2:21 PM, Mathieu Desnoyers
<compudj at krystal.dyndns.org> wrote:
> * Laurent Chavey (chavey at google.com) wrote:
>> in lttctl 40, we use to have xml files describing the various facilities.
>> when migrating to a newer version of lttng, I noticed that the facilities
>> are not present anymore.
>>
>> - what do we do about those xml files, are they still needed ?
>>    if not, then how are custom facilities supported ?
>>
>> thx
>>
>
> Hi Laurent,
>
> The event descriptions are now fully contained in the markers. The
> kernel exports the event description through the control/facilities_*
> channel files automatically.
>
> So, basically, adding a new event is as simple as adding a new marker in
> the kernel code.
>
> Userspace tracing work is "work in progress", but works work x86 and
> will soon work for x86_64. It will use a userspace version of the marker
> infrastructure.
>
> Mathieu
>
>
> --
> Mathieu Desnoyers
> OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
>