[ltt-dev] LLTng probes

[Mathieu Desnoyers]

* Jyotiswarup Raiturkar (Jyotiswarup.Raiturkar at arm.com) wrote:
> Hello
> 
>  
> 
> I'm looking at LTTng working inside the kernel, and trying to understand
> the instrumentation.
> 
>  
> 
> However, I am not able to see how the DEFINE_MARKER_TP() macros and
> other probe_* functions in kernel-trace.c are actually used . As I
> understand it, to make the actual trace, modules would have to call the
> probe_* functions; yet I'm not able to locate these calls.

The probes are connected to the tracepoints with:

kernel:marker.c: set_marker()

                     ret = tracepoint_probe_register_noupdate(
                                elem->tp_name,
                                elem->tp_cb);

Which is called when a marker is enabled. The markers are listed in a
table which is defined by the DEFINE_MARKER_TP() macros.

Thanks,

Mathieu

> 
>  
> 
> Thanks
> 
> Jyoti
> 
> -- 
> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium.  Thank you.

> _______________________________________________
> ltt-dev mailing list
> ltt-dev at lists.casi.polymtl.ca
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev


-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com