[lttng-dev] [documentation] Drawing: LTTng architecture in relation to the commandline / buffer options

[Randy Wijnants]

Thanks for your reply!

Changed the dashed arrows into dotted arrows.

Is the arrow running from the lttng session daemon to liblttng-ust valid?
Does the liblttng-ust always write to the shared memory buffer or only if
the session daemon instructs it to (via which interface?)
And what is the interface used between the session en consumer daemon?

New version:
http://tty32.org/Logging%20configuration2.png

Greetings,
Randy Wijnants.
"The good part about UDP jokes is that i don't have to worry if you get it
or not"


On 26 May 2014 18:37, Thibault, Daniel <Daniel.Thibault at drdc-rddc.gc.ca>wrote:

> ----------------------------------------------------------------------
> Date: Mon, 26 May 2014 11:27:35 +0200
> From: Randy Wijnants <randy at tty32.org>
>
> > I've drawn the LTTng architecture in relation to the commandline /
> buffer options.
> > It would be nice if it would be used on the lttng website (if you find
> it usefull ofcourse).
> > I'm using this for a presentation at our company to explain more
> in-depth lttng configuration details.
> >
> > Originally posted on IRC. As suggested by Compudj i've released it under
> CC license.
> >
> > Let me know what you think of it or if you have suggestions /
> improvements
> >:)
> > I can also provide SVG image, or push it to the repo?
> >
> > http://tty32.org/Logging%20configuration2.png
> >
> > Randy Wijnants.
> ----------------------------------------------------------------------
>    SVG, please.  I may end up integrating it into the DocBook
> documentation.
>
>    The dashed arrows running from userspace to liblttng-ust and the kernel
> to LTTng kernel module(s) don't make sense.  The remaining dashed arrows
> (all running from the session daemon) all represent control flow, which is
> not what happens between userspace/kernel and
> liblttng-ust/LTTng-kernel-modules.  You should use a different convention,
> such as dotted arrows.
>
>    The enable-channel arrow should be accompanied by an enable-event arrow
> (same functionality, different resolution).
>
>    You could also add a box for the lttng client, which talks to
> (controls) the session daemon.
>
> Daniel U. Thibault
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