[lttng-dev] [PATCH] Expose kernel tracer to user-space (version 6)

[Mathieu Desnoyers]

Just a bit of follow-up: has this been merged ? If not, is there a
latest version available somewhere ?

Thanks,

Mathieu

* Francis Giraldeau (francis.giraldeau at gmail.com) wrote:
> Le 2012-07-03 15:40, Mathieu Desnoyers a écrit :
> >> It's not possible to remove the module while an active tracing session
> >> references the event lttng_uevent. I tested insertion/removal of the
> >> module while tracing with the previous version that was using RCU and it
> >> was working well.
> > 
> > But you don't need to have an active tracing session to perform the test
> > I point to above. Could you run it on this latest version ?
> 
> Ok. I updated the test to run in a loop rmmod/modprobe, while writing
> with 20 threads into /proc/lttng_uevent. The result is that the module
> can be unloaded properly, the test shows no race that prevent the module
> to be unloaded or other problems.
> 
> If somebody wants to test it for themselves, I added the code for this
> test under workload-kit/tests.
> 
>   * test-uevent : runs 4 times 20 threads each producing 64k events
>   * module-reload-forever.sh : rmmod/modprobe of lttng_uevent
>   * test-uevent.sh : quick wrapper for testing functionnality
> 
> Thanks!
> 
> Francis
> 



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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com