[lttng-dev] lttng - ubuntu 11.10 - problem

[bapi_mvit2004@yahoo.com (somanath sahoo)]

Hi,

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 at 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,
Somanath
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lttng.org/pipermail/lttng-dev/attachments/20120615/87cd04df/attachment-0001.html>