Hi,
On 02/19/2015 06:31 AM, Neil Bryan wrote:
Hello Forum,
Now that I have got LTTng built, I have tried some preliminary tests.
Unfortunately the results are not quite as I expect.
I have used LTTng previously, although I did not perform the kernel
integration. Using Eclipse TFM I could see various processes in the Control
Flow tab.
With low-level kernel events (interrupts, sched_wakeup etc) causing threads to
run or remain blocked. On my system I only see event data in the Histogram view
and in the Statistics tab.
Something has not been enabled in my build (tracepoints?) and I only have a
limited amount of instrumentation. My Control Flow tab is blank and I don't see
any driver threads or stuff
that I am interested. Any clues as to what is missing?
If you import a kernel trace as a "Generic CTF Trace", the viewer will
only use information common to all CTF traces, which is not much. To get
the kernel-specific views and anlaysis working, it needs to be imported
as a "LTTng kernel trace". But then you said this was not working:
I imported this into eclipse as a Generic CTF Trace. Using LTTng kernel trace
gave me a Validation Failed error.
Which version of LTTng are you using? As mentioned in the other thread,
you should make sure to use a recent version. To validate kernel traces,
we verify that the trace's metadata (in the "metadata" file) contains
"domain = kernel" in its environment. I don't remember in which version
exactly this was added, and I'm not sure it was present in LTTng 2.0.
I have checked the plug-ins and features on eclipse (Version: Kepler Service
Release 2
Build id: 20140224-0627) and all looks sensible.
This is also quite old ;) The LTTng integration plugins for Eclipse have
recently moved to the Trace Compass project [1]. You can find the latest
versions on the Downloads page [2], both for the stand-alone program,
and the plugins to add to an existing Eclipse installation.
Cheers,
Alexandre
[1] http://www.eclipse.org/tracecompass
[2] http://projects.eclipse.org/projects/tools.tracecompass/downloads
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