To be able to trace the kernel you need to make sure to that the
LTTng kernel modules are installed. Moreover, the lttng-sessiond has
to run as root as well as your user ID has to be in the tracing
group.
Besides, it should work with UST as well. The only thing you have to
make sure that you use per UID buffers since the current streaming
implementation of Trace Compass works only with a single trace.
I just tried it. I created a session as I described earlier. But
this time I enabled UST events (no kernel). Having only the Events
Table open, the live trace reading was ok.
/Bernd
On 03/10/2016 09:55 AM, Michael Steppe
wrote:
Alexandre,
Sorry for the late reply. To answer your questions, yes I am on
CentOS 6.5. I wrote an init.d script for both lttng-sessiond and
lttng-relayd so that they both start on boot. Very simple init
scripts that simply call "start_daemon /usr/bin/lttng-relayd -d"
and the same for sessiond. I have also become aware that after I
create a Session in the LTTng Control view, when I go to Enable
a Channel on that session, that the Kernel Domain is greyed out.
Is there a reason I cannot select this? Even when trying to
Enable Events, I cannot select the Kernel Domain. I cannot
follow the steps that Bernd gave me if I cannot enable kernel
events:
In the LTTng Control view
- Right mouse-click on Sessions
- Click on context-sensitive menu item "Create Session..."
- Enter session name (optional)
- Click on Live radio button
- Click on OK button.
After that enable relevant events and start the session. Then
click on the import button of the toolbar of LTTng Control
view (alternatively right mouse click on the session in the
tree and click on "Import..."). This will create a link to the
trace in the Project Explorer under the "Remote" tracing
project. Also, it will open the trace. The trace name is the
session name.
On my machine, I only enabled the sched_switch event of the
Kernel. In my case the Events Table, Histogram view, Control
Flow view is updated. It works but it seems to be very slow.
Then I closed all views besides the Events Table and it works
better.
See screenshots below:
 
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