[
Date Prev][
Date Next][
Thread Prev][
Thread Next][
Date Index][
Thread Index]
[
List Home]
|
[tracecompass-dev] Support for Perf CTF traces now in master (was Re: FW: [RFC 0/5] perf tools: Add perf data CTF conversion)
|
On 11/09/2014 08:31 PM, Alexandre Montplaisir wrote:
On 2014-11-05 10:25 PM, Alexandre Montplaisir wrote:
But if you could for example tell me the perf equivalents of all the
strings in that file, I could hack together such wrapper. With that,
in theory, perf traces should behave exactly the same as LTTng traces
in the viewer!
Oooh, that would be awesome. So I installed maven but didn't get much
further. Let me gather this for you.
Awesome, thanks!
I am travelling this week, so I'm a bit busy, but I will try to
prototype a "wrapper" for the kernel analysis, and adding support for
the perf events, whenever I have a chance. I'll keep you posted.
Ok, some good news!
I managed to get the CTF traces from perf working in Trace Compass!
See attached screenshots. This is showing the "ctf-out2" trace from
your previous email. The other trace seems to have less events
enabled, so it would only show some WAIT_FOR_CPU states in the view.
If anybody wishes to try it, you can grab the whole branch ending at
https://git.eclipse.org/r/#/c/36200/ . Or run:
$ git fetch
git://git.eclipse.org/gitroot/tracecompass/org.eclipse.tracecompass
refs/changes/00/36200/3 && git checkout FETCH_HEAD
Just a quick note, this branch is now merged to master. So anyone who
pulls the code from the master branch at
git://git.eclipse.org/gitroot/tracecompass/org.eclipse.tracecompass.git
should be able to load perf-CTF traces in the viewer. The trace type is
now called "Common Trace Format -> Linux Kernel Trace" and should
support both LTTng kernel and perf traces in CTF format (although
auto-detection should work in most cases).
This was based on the most recent file format I was aware of, we will
update it accordingly if required.
Testing welcome!
Cheers,
Alexandre
It reuses much of the code from the LTTng analysis, which is why it
was relatively quick to do. For now, it looks for the domain in the
CTF environment to be "kernel-perf". But this will be easy to update,
if needed, once the final format is decided.
Maybe I missed it, but I couldn't find the system call names in the
trace. Using the sys_enter and sys_exit events, the viewer is able to
determine the kernel-mode states (in blue), but we cannot show the
exact system call names like we do with LTTng.
There is also something weird with the arrows in the Control Flow View
(disabled in the screenshot), I don't know if it's due to the
particularity of the trace or to a bug in the view. We'll investigate.
Feedback is very welcome.
Cheers,
Alexandre
