When the trace buffers are saved to disk?

[Adel Belkhiri]

Thank you for the clarification, Thomas. Indeed, the documentation for the
trace library is kind of limited. If you don't mind, I have another
question: Would it be useful to have an API to register a callback (to save
trace data) when the buffer is full?

On Fri, Nov 29, 2024 at 6:44 AM Thomas Monjalon <thomas at monjalon.net> wrote:

> 28/11/2024 20:17, Adel Belkhiri:
> > Hi all,
> >
> > Recently, while tracing applications from the apps and examples
> > directories, I became confused about when the trace buffer is written to
> > disk. Is the trace data saved only when rte_save_trace() is called, or
> does
>
> It is rte_trace_save()
>
> > it also automatically save when the buffer becomes full?
>
> No, DPDK is not doing such thing without user agreement.
>
> > From my understanding, rte_save_trace() is invoked when the application
> > executes rte_eal_cleanup(). Does this mean the target application needs
> to
> > explicitly support tracing by calling rte_save_trace()—perhaps at regular
> > intervals—to dump the trace buffer to disk? Otherwise, will we only get a
> > fragment of the trace saved during rte_eal_cleanup() execution?
>
> Yes you get it right.
>
> > Thank you for clarifying this point.
>
> Thanks for asking.
>
> If you think the doc below is not clear enough,
> do not hesitate to submit a patch to make the doc better:
>
>         https://doc.dpdk.org/guides/prog_guide/trace_lib.html
>
>
>
>
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