From mboxrd@z Thu Jan 1 00:00:00 1970 From: bapi_mvit2004@yahoo.com (somanath sahoo) Date: Fri, 15 Jun 2012 00:41:28 -0700 (PDT) Subject: [lttng-dev] lttng - ubuntu 11.10 - problem Message-ID: <1339746088.90723.YahooMailNeo@web161201.mail.bf1.yahoo.com> Hi, As i am new to lttng usage, I have followed the instructions from 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 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: