[lttng-dev] LTTng UST structure support

[Jérémie Galarneau]

Hi Charles,

I can't really comment on what the packages do, but babeltrace2 provides those headers under "include/babeltrace2-ctf-writer" since that library is somewhat "grafted" to the project. Which distro are you using?

As for where to "plug" your bindings, that library is there to maintain compatibility with the ctf-writer library that was provided by Babeltrace 1.x as it had a number of external users. I don't expect it to keep up with new CTF versions.

A more "future proof" integration point is to write a source component, and instanciate it in a graph configured with the CTF filesystem sink, and feed your events through the graph.

Let me know if you want more information,
Jérémie

--
Jérémie Galarneau
EfficiOS Inc.
https://www.efficios.com

________________________________
From: lttng-dev <lttng-dev-bounces at lists.lttng.org> on behalf of chafraysse--- via lttng-dev <lttng-dev at lists.lttng.org>
Sent: February 2, 2023 11:06
To: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
Cc: lttng-dev at lists.lttng.org <lttng-dev at lists.lttng.org>
Subject: Re: [lttng-dev] LTTng UST structure support

Hi,

So I wrote a draft of Rust lib above ctf-writer, using the apis as demonstrated in the ctf-writer test
For deployment I wanted to use "libbabeltrace2-ctf-writer.so" in the "libbabeltrace2-dev" package but I could not locate the matching includes in there or in the other babeltrace 2 packages
Did I miss them somewhere ? Should I have plugged in at another level in babeltrace2 ?

Best regards,

Charles

----- Mail original -----
De: chafraysse at free.fr
À: "Mathieu Desnoyers" <mathieu.desnoyers at efficios.com>
Cc: lttng-dev at lists.lttng.org
Envoyé: Lundi 16 Janvier 2023 10:38:28
Objet: Re: [lttng-dev] LTTng UST structure support

Hi Mathieu,

Thanks for your reply :)
I'll stick to bt2 modules in the meantime then
I'll already be saving a ton of time with those and the CTF spec which is great !

Best regards,

Charles

----- Mail original -----
De: "Mathieu Desnoyers" <mathieu.desnoyers at efficios.com>
À: chafraysse at free.fr, lttng-dev at lists.lttng.org
Envoyé: Jeudi 12 Janvier 2023 21:10:57
Objet: Re: [lttng-dev] LTTng UST structure support

On 2023-01-09 09:02, chafraysse--- via lttng-dev wrote:
> Hi,
>
> I'm looking for a CTF writer to serialize instrumentations in an
> embedded Linux/Rust framework
> LTTng UST looked like a very strong option, but I want to serialize
> structures as CTF compound type structures and I did not see those
> supported in the doc or api

This is correct. I am currently working on a new project called
"libside" (see https://git.efficios.com/?p=libside.git;a=summary) which
features support for compound types.

However, we still need to do the heavy-lifting implementation work of
integrating this with LTTng-UST. This is the plan towards supporting
compound types in LTTng-UST.

> I'd love to have confirmation that I did not just miss something :)
> If LTTng UST is out for me I will probably try to use the ctf-writer
> module of babeltrace 2 instead

For now the ctf-writer modules of bt2 would be an alternative to
consider, but remember that it is not designed for low-impact tracing
such as lttng-ust. So it depends on how much tracer overhead/runtime
impact you can afford in your use-case.

Thanks,

Mathieu

>
> Best regards,
>
> Charles
> _______________________________________________
> lttng-dev mailing list
> lttng-dev at lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev

--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com

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