Date: Tue, 24 Sep 2013 13:42:44 -0700 (PDT)
From: Thuya Aung <[email protected]>
> With lttng 2.3.0 in Ubuntu 12.04 LTS, I only get the tracepoints in kernel
> folder with snapshot mode. I do not see anything for userspace tracepoints.
> The following is the way I setup for lttng session
>
> lttng create mySession --snapshot
> lttng enable-channel kCh --buffers-global --subbuf-size=1048576 -k
> lttng enable-event -a -k
> lttng enable-channel uCh --buffers-uid --subbuf-size=1048576 -u
> lttng enable-event -a -u
> sleep 1
> lttng start mySession
> sleep 60
> lttng snapshot record
> lttng stop mySession
> lttng destroy mySession
>
> I got the error message saying "Undefined command" with the following
>
> lttng add-output -n myNewOutput file:///home/taung/output (<--- following the
> examples of man 1 lttng)
>
> Did I do something wrong? What else I should be doing in order to use
> snapshot feature?
>
> Thuya Aung
I can confirm this problem (I ran my usual user-space event generator and
got nothing for UST in the snapshot). Regarding your script, there is one
mistake made twice: when you enable-event, you need to specify the channel.
You should have gotten an error ("Error: Events: Non-default channel exists
within session"). The correct script lines are:
lttng enable-event -a -k -c kCh
lttng enable-event -a -u -c uCh
As for the output, the mistake is simple. The correct line is:
lttng snapshot add-output -n myNewOutput file:///home/taung/output
add-output is a snapshot action, not an lttng command. Additionally,
because a snapshot output is created by default, you must delete it first
(currently there is just one output slot):
lttng snapshot del-output 1
lttng snapshot add-output -n myNewOutput file:///home/taung/output
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