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From: Steven Rostedt via lttng-dev <lttng-dev@lists.lttng.org>
To: Philippe Proulx <pproulx@efficios.com>
Cc: lttng-dev <lttng-dev@lists.lttng.org>,
	Jeremie Galarneau <jgalar@efficios.com>,
	"linux-trace-devel@vger.kernel.org"
	<linux-trace-devel@vger.kernel.org>
Subject: Re: [lttng-dev] Usage example of libbabeltrace (babeltrace2) to read CTF traces from a GUI
Date: Tue, 15 Jun 2021 11:57:38 -0400	[thread overview]
Message-ID: <20210615115738.46818ace@oasis.local.home> (raw)
In-Reply-To: <CAB4xu_1H-4gdandyRx+F0nb1g+sLKatx=oJdzQspM+3hJXoYhA@mail.gmail.com>

[ Adding linux-trace-devel too ]

On Tue, 15 Jun 2021 11:13:41 -0400
Philippe Proulx <pproulx@efficios.com> wrote:

> On Mon, Jun 14, 2021 at 4:01 PM Mathieu Desnoyers via lttng-dev
> <lttng-dev@lists.lttng.org> wrote:
> >
> > Hi Philippe, Hi Jeremie,
> >
> > Steven is interested to use libbabeltrace as a CTF trace reader in the KernelShark
> > project. It's a GUI which shows Linux kernel traces.
> >
> > He notices that most of the documented usage examples of the libbabeltrace API
> > focus on use-cases where a custom trace format is converted into CTF.
> >
> > I know that the babeltrace2 program is the main user of libbabeltrace at this
> > point, and that it reads CTF as source.
> >
> > For using libbabeltrace as CTF reader for a GUI, what would be the best examples
> > to look at as starting point ? Perhaps the babeltrace2 binary, or just adapt a
> > smaller example program and change the custom trace format source to "ctf.fs" ?
> > Or anything else ?  
> 
> Hello,
> 
> Unfortunately, the Babeltrace 2 C API documentation [1] doesn't offer a
> graph building example at the moment.
> 
> Therefore, indeed, the "best" example would be the babeltrace2(1) CLI
> (see `src/cli`), although I understand that it's a very generic example
> which can be overwhelming to explore.
> 
> However, note that instead of instantiating an existing sink component
> class (as found in a plugin), you'll want to make your own sink
> component class to get access to each event message while also
> controlling the graph operations. Using
> bt_graph_add_simple_sink_component() [2] would be a good start.
> 
> I can cook a minimal working example in the following days.

That would be great, thanks!

-- Steve

> 
> Phil
> 
> [1]: https://babeltrace.org/docs/v2.0/libbabeltrace2/
> [2]: https://babeltrace.org/docs/v2.0/libbabeltrace2/group__api-graph.html#gaa8432f03a967d01b764fb1bc959c8e89
> 
> >
> > Thanks,
> >
> > Mathieu
> >
> > --
> > Mathieu Desnoyers
> > EfficiOS Inc.
> > http://www.efficios.com
> > _______________________________________________
> > lttng-dev mailing list
> > lttng-dev@lists.lttng.org
> > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev  

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  reply	other threads:[~2021-06-15 16:16 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14 20:00 Mathieu Desnoyers via lttng-dev
2021-06-15 15:13 ` Philippe Proulx via lttng-dev
2021-06-15 15:57   ` Steven Rostedt via lttng-dev [this message]
2021-06-19  3:42     ` Philippe Proulx via lttng-dev

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