[lttng-dev] lttclt hungs on destroying traces on 2.6.33.2+rt13 (PREEMPT_RT)

[Piotr Romaniuk]

Thank you Mathieu.
It works fine after application the patch on my kernel.

Indeed, needed changes are in:
     lttng-fix-rt-kernel-teardown.patch
included in patch-2.6.35.2-lttng-0.224.tar.gz.
(just for people who meet the same problem and will browse the list).

Regards,
Piotr Romaniuk


W dniu 2012-02-20 15:42, Mathieu Desnoyers pisze:
> * Piotr Romaniuk (piotr.romaniuk at elesoftrom.com.pl) wrote:
>    
>> Hi,
>>
>> I have a problem with getting traces on kernel 2.6.33.2 with PREEMPT_RT
>> patch.
>> I can run ltt-armall and create traces by lttctl but when I destroy
>> traces  lttclt hungs.
>> Is there any fundamental obstacle in RT-kernel for LTT?
>>
>> I use following versions:
>> 1) kernel 2.6.33.2
>> 2) patch-2.6.33.2-rt13 from
>> http://www.kernel.org/pub/linux/kernel/projects/rt/2.6.33/older/
>> 3) LTTng: patch-2.6.33.2-lttng-0.212
>> 4) LTT control: 0.89-05122011
>>
>> I tuned slightly LTTng patches in order to apply them on rt kernel.
>> The changes were rather easy and were limited to adaptation of
>> surrounding context
>> that had been changed by RT-patch.
>> I built the kernel (all LTT modules I built in the kernel) successfully.
>>
>> The problem appears when I try to destroy traces. Lttctl hungs and no
>> data are copied to files.
>>
>> Do you have any suggestions?
>>      
> You should grep for "CONFIG_PREEMPT_RT" within later versions of lttng
> 0.x. Modifications were done to locking to support RT, and without those
> the destroy operation was hanging.
>
> If this does not work out for you, you should probably move to LTTng 2.0
> prereleases, since LTTng 0.x is not supported anymore.
>
> Thanks,
>
> Mathieu
>
>    
>> Regards,
>> Piotr Romaniuk
>>
>>
>>
>>
>>
>>
>>
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>>      
>