[lttng-dev] User Space Tracing

[John O'Sullivan]

I am really struggling trying to get user space tracing working predictably and consistently and would appreciate some help.


I created a trace event called

kvm_server:new_connection_tracepoint (see attached), I then use lttng-gen-tp to generate the .c and .h files which I link to the program and call with

tracepoint(kvm_server, new_connection_tracepoint, .................)

This appears predictably in my traces

However if I call my second tracepoint (see attached)

tracepoint(resolution_management, resolution_management_tracepoint,.......)

It never appears in any of the traces

I can see no significant difference between the two definitions.


I then created a third trace definition called simple_example (see attached)

tracepoint(simple_example, simple_example_tracepoint, .....)

This again appears in the trace


I start the tracing using

lttng enable-event -u -a      # enable user-space tracing

I then use babel trace to dump the trace,


'kvm_server' and 'simple_example' appear in the trace,  resolution_management does not.



Any idea why the resolution_management tracepoint does not appear in any traces or is there some way of debugging the tracecall macro itself?


regards

John

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