[lttng-dev] help on using command lttng enable-event just one trace point -u

[David Goulet]

Hi,

You are probably missing a part of the event name.

Once your application is started, you can use "lttng list -u" to list
the available events for UST tracing. It should look something like that
(this is taken from the hello example in UST code tree).

ust_tests_hello:tptest (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)

$ lttng enable-event ust_tests_hello:tptest -u

When creating a tracepoint event in your application, you have this:

TRACEPOINT_EVENT(ust_tests_hello, tptest, ...)

You have to use both part with ":" between which are the component name
and name of the tracepoint. See lttng-ust(3) for an explanation.

Thanks!
David

mohammad reza rejali:
> Dear Sir/Madam
> 
> I am new in this area, I downloaded the examples and run the sample file
> but there is a problem.
> I used this command lttng enable-event sample_component -u
> But when i use this and lltng start and then stop when I use this
> command lttng view, Nothing show me,the only thing it shows is the
> directory that created for my session.
> On the other hand, when I use lttng enable event -a -u and run my
> code,when i use lttng view i could see the trace.
> I really appreciate your help and thank you in advance.
> 
> Best Regards,
> Mohammad
> 
> 
> This body part will be downloaded on demand.