[ltt-dev] Run simultaneous lttng kerner tracer and userspace tracer

[Mathieu Desnoyers]

* patrick mekeze (pmekeze at yahoo.fr) 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
> 
> 
>       
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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com