Re: [PATCHv3 3/3] dynamic_debug: Add a flag for dynamic event tracing

Sai Prakash Ranjan
2021-11-09T17:50:55Z

On 11/9/2021 11:10 PM, Steven Rostedt wrote:
> On Tue, 9 Nov 2021 23:00:11 +0530
> Sai Prakash Ranjan <quic_saipraka@quicinc.com> wrote:
>
>> Ah that's a very good idea, descriptor does contain the module, file name.
>> We can probably even pass the module name,file name as string from the
>> descriptor itself to event?
>> Perhaps we can do that for all trace events and not just this trace
>> event? Just like the trace event name displayed
>> with trace events, perhaps have file name,module name displayed when
>> dynamic debug is enabled? Filtering by
>> filename is pretty useful since most of these usecases in debugging will
>> be with respect to some driver or subsystems.
> If we add this for all events, it would require a lot of changes to all
> users of tracepoints, as it would require adding a new parameter to the
> callbacks.
>
> We could add a flag in the registering that states that the callback is OK
> for it, and it passes that data as well.
>
> Let me look into this for a bit. I may not have something this week, but
> we should look into this more before adding little hacks that do this one
> at a time like this patch.
>
> -- Steve

Sure, thanks for the help and review. I can skip this patch adding
support for dynamic event tracing
till we have something concrete as the previous patches doesn't depend
on this.

Thanks,
Sai