[libcamera-devel] [PATCH] guides: tracing: Mention where to find the trace file

[Kieran Bingham]

Quoting Paul Elder (2021-11-26 07:42:19)
> Add a couple sentences describing where to find the trace file, and how
> to view it even after the tracing session is destroyed.
> 
> Signed-off-by: Paul Elder <paul.elder at ideasonboard.com>
> ---
>  Documentation/guides/tracing.rst | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/guides/tracing.rst b/Documentation/guides/tracing.rst
> index 9c688b93..ae960d85 100644
> --- a/Documentation/guides/tracing.rst
> +++ b/Documentation/guides/tracing.rst
> @@ -117,6 +117,12 @@ A trace can be collected fairly simply from lttng:
>  
>  See the `lttng documentation <https://lttng.org/docs/>`_ for further details.
>  
> +The location of the trace file is printed when running
> +``lttng create $SESSION_NAME``. After destroying the session, it can still be
> +viewed by: ``lttng view -t $PATH_TO_TRACE``, where ``$PATH_TO_TRACE`` is the
> +path that was printed when the session was created. This is the same path that
> +is used when analyzing traces programatically, as described in the next section.
> +

Aha - thanks that helps me now. And now I've gone deeper I can see we
can specify a path to save it too, which would be useful.

 lttng create --output=PATH

will let a user (script) choose where to save the trace.

It might be helpful to add something about that, but even without:


Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>


>  Analyzing a trace
>  -----------------
>  
> -- 
> 2.27.0
>