[lttng-dev] User Space Tracing

[Philippe Proulx]

In `resolution_management_tp.tp`, can you try using the exact same
`TP_ARGS` content for both `TRACEPOINT_EVENT_INSTANCE` (also matching
the `TP_ARGS` content of `TRACEPOINT_EVENT_CLASS`)? It's the only
difference I can see.

Philippe Proulx
Philippe Proulx


On Thu, Sep 27, 2018 at 12:15 PM John O'Sullivan
<John.OSullivan at blackbox.com> wrote:
>
> 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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