[ltt-dev] ust 0.3 problem

[Pierre-Marc Fournier]

thirumalai.p wrote:
> Hi,
> At the end it worked for me. libraries installed and lttv installed
> successfully. I started my testing with tests/basic directory by running
> usttrace ./basic. After some time it gave me trace was successful and trace
> was stored on /root/ folder then i try to open it using Lttv-gui by using
> the command lttv-gui -t <pathtomytrace>. Trace is opening successfully but
> the graphical view which i used to see on kernel tracer[different colors
> for different event like for waiting cpu was shown by dark magenta] is not
> shown on the trace. But the time line is moving in the output when i
> traversing the trace output. 
> 
> I just want to know whether this things only come for kernel tracers alone
> or will it come to user tracer also?

The view you are talking about, the control flow view, needs events
about irqs, scheduling, system calls, traps, softirqs, process creation
and destruction. This information is available in the default kernel
instrumentation. So yes, you need a kernel trace to have the events that
permit the drawing of content in this view.

For the userspace tracer, it would be hard and inefficient to get all
this information. The UST is rather used for tracing events inside
userspace code.

Of course you can record both a kernel and userspace trace
simultaneously, open both in lttv and get all the information.

> 
> Thank you,
> Thirumalai
> 
> **************** CAUTION - Disclaimer *****************This email may contain confidential and privileged material for the
> sole use of the intended recipient(s). Any review, use, retention, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender by reply email and delete all copies of this message. Also, email is susceptible to data corruption, interception, tampering, unauthorized amendment and viruses. We only send and receive emails on the basis that we are not liable for any such corruption, interception, tampering, amendment or viruses or any consequence thereof. 
> *********** End of Disclaimer ***********DataPatterns ITS Group**********
>