[lttng-dev] lttng - ubuntu 11.10 - problem

somanath sahoo bapi_mvit2004 at yahoo.com
Fri Jun 15 03:41:28 EDT 2012


As i am new to lttng usage, I have followed the instructions from <https://launchpad.net/~lttng/+archive/ppa> in order to install the lttng tool set in my ubuntu 11.10.
After successful installation, i followed the getting started link on lttng.org <http://lttng.org/quickstart> in "root mode".

1. when i am executing the first command - 

    # lttng list -k

    i am getting the following error
    " Error: Unable to list kernel events"

2. # lttng create mysession
    Session mysession created.

3. # lttng enable-event sched_switch,sched_process_fork -k
    Error: Event sched_switch: Kernel tracer not available (channel channel0, session mysession)
    Error: Event sched_process_fork: Kernel tracer not available (channel channel0, session mysession)
    Warning: Some command(s) went wrong 

4. # lttng start
    Tracing started for session mysession

5. # lttng stop
    Tracing stopped for session mysession

6.  # lttng destroy
    Session mysession destroyed at /root


I have checked that lttng-sessiond is running by below command 

# ps -ef|grep lttn
root       535     1  0 Jun14 ?        00:00:00 lttng-sessiond
somanath  5359     1  0 Jun14 pts/1    00:00:00 lttng-sessiond --sig-parent --quiet
root     19514 19495  0 12:44 pts/2    00:00:00 grep --color=auto lttn


Could anyone please help me to understand or clarify why kernel tracer is not available when above point (3) / (1) is executed or whether i need to do anything more , please let me know so that i can start using lttng in ubuntu 11.10 successfully.

I have googled about this problem, I got to know about this similar problem from one link - http://www.mail-archive.com/lttng-dev@lists.lttng.org/msg00763.html
However i executed all this commands under root and explicit lttng-seesiond start, But still the problem is persistant.

Any help will be appreciated.

Thanks & Regards,
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