[lttng-dev] tracing page_faults with lttng?

[Francis Deslauriers]

Hi Milian,
Are you running on an x86 processor?
The pagefault tracepoints are called : x86_exceptions_page_fault_user,
x86_exceptions_page_fault_kernel
Can you see those tracepoints when you run: lttng list --kernel

Thank you,
Francis

2017-05-24 12:00 GMT-04:00 Milian Wolff <milian.wolff at kdab.com>:

> Hey all,
>
> when I trace with perf, I can see page_faults occurring. But when I do
> something like the following with lttng:
>
> lttng create
> lttng enable-channel kernel -k
> lttng enable-event -c kernel -k -a
> lttng start
> # trigger page faults
> lttng stop
>
> then I do not see any page faults in tracecompass/babeltrace. What do I
> need
> to do to see those too? I'm aware that lttng comes with its own set of
> tracepoints - i.e. it's not using the same tracepoints that perf knows
> about.
> But googling shows me e.g. this:
>
> https://lists.lttng.org/pipermail/lttng-dev/2013-April/019954.html
> https://lists.lttng.org/pipermail/lttng-dev/2016-May/026033.html
>
> Which sounds like the feature should be available in lttng too?
>
> I'm using the ArchLinux packages in AUR, i.e. version 2.9.2 of LTTng and
> kernel 4.10.13-1.
>
> Thanks
> --
> Milian Wolff | milian.wolff at kdab.com | Software Engineer
> KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
> Tel: +49-30-521325470
> KDAB - The Qt Experts
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>
>


-- 
Francis Deslauriers
Software developer
EfficiOS inc.
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