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

[patrick mekeze]

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 <compudj at krystal.dyndns.org>
À : patrick mekeze <pmekeze at yahoo.fr>
Cc : ltt-dev at lists.casi.polymtl.ca
Envoyé le : Sam 19 juin 2010, 18h 11min 45s
Objet : Re: [ltt-dev] Run simultaneous lttng kerner tracer and userspace tracer

* 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



      
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