[ltt-dev] the problem of register the probe function for irq_enty

[Mathieu Desnoyers]

* long xu (long.x.xu at gmail.com) wrote:
> Hello,
> 
> i'm reading the code of lttng now, i kown the programe use
> ---------------------------------------------
> DEFINE_MARKER_TP(kernel, irq_entry, irq_entry, probe_irq_entry, "ip %lu
> irq_id #2u%u kernel_mode #1u%u");----------------------------------------
> to give the pointer of tracepoint probe function to the marker. But i have
> not found how does it connect the  probe_irq_entry to the tracepoint. i
> don't find where it use the function register_trace_irq_entry to register
> the probe function.
> 

See kernel/marker.c :

set_marker()

call to tracepoint_probe_register_noupdate(). Basically, it's the marker
infrastructure which is responsible for iterating on the marker section
of core kernel and module to connect them to tracepoints.

Mathieu

> Thanks,
> 
> Best regard
> 
> XU Long

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-- 
Mathieu Desnoyers
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