thank mathieu for this clear answer. i have run my application as you have explained and it work very well. but what i was searching about is how to run and trace a userspace application without use usttrace. now i have found a answer of this question in the userspace trace manuel. the answer consist to mount the ltt-userspace-event module in the kernel. this will enable in the /mnt/debugfs/ltt directory a virtual file name's write_event. writing in this file would generates a event in the kernel and the string that you have write would be the event parameter
thank, Patrick ________________________________ De : Mathieu Desnoyers <[email protected]> À : patrick mekeze <[email protected]> Cc : [email protected] Envoyé le : Sam 19 juin 2010, 18h 11min 45s Objet : Re: [ltt-dev] Run simultaneous lttng kerner tracer and userspace tracer * patrick mekeze ([email protected]) wrote: > Hello every boby! > > I am a high school student and it is now about one month that i decided to > interest on lttng projet because i was searching about some metric tools for > unix systems. > The goal of my research is to develop a tool which would work as a "fligth > recover " for a unix system running on a power PC hardward support. > > i decided to work for the first time on an intel processor and after, i will > make a croos compilation for my target which is a power PC processor > > I have already built a linux kernel with the lttng patch and i have install > all the need tool to have a lttv analyser > > Because i would like to trace some programm running on userspace, i have > install usttrace tool. > > After this i wrote a short application with a marker inside as i see in the > usttrace tutorial available on website. > > When i run this with command $usttrace ./testprogramm , i have in the promt > the name of directory where trace are logged and i can use lttv to analyze > it. here i can see well my event "myevent" on the wiever. > > But when i activated kernel trace with command $ lttctl -C -w /tmp/trace1 > trace1, and run my userspace programm with command $ ./testprogramm, i am > not able to get the myevent. > > so that, i want to know how tu run lttctl tools and userspace programm to get > and analyze simultaneous on the lttv-gui ,kernel event and userspace event. lttctl is only for kernel traces. If you want to combine both traces: lttctl -C -w /tmp/trace1 trace usttrace myprog lttctl -D trace lttv-gui -t /tmp/trace1 -t /path_to_ust_saved_trace That should work. And don't forget to edit the usttrace source code to select the kernel tracer compatible trace clock timestamp source, else your timestamps will be desynchronized. Mathieu > > thank you all for your help. > > Patrick > > > > _______________________________________________ > ltt-dev mailing list > [email protected] > http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com
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