[ltt-dev] 2.6.12-rc4-mm2-lttng-0.4.3 vs LTT in MVista 2.6.10

[ltt-dev] 2.6.12-rc4-mm2-lttng-0.4.3 vs LTT in MVista 2.6.10

[Mathieu Desnoyers]

* Brian Hutchinson (b.hutchman at gmail.com) wrote:
> Hi,
> 
> First post.  I'm trying to determine if the features in the LTTng
> version 0.4.3 would be any better than the version of LTT that came
> with our MVista 2.6.10 kernel.
> 
> Obviously, my time would be better spent trying to get a newer kernel
> & LTTng going but we have an immediate need to debug a 2.6.10 based
> app.

I'd recommend trying to run the application under a newer kernel, hoping
to reproduce the problem. You might be lucky.

I don't see much value in trying to resurrect the first LTTng versions
ever published.

Thanks,

Mathieu

> 
> Does anyone have experience going back this far that can comment?
> 
> I used the older LTT around the time Karim came out with the 1st
> version of his Embedded Linux book but I'm not familiar with what
> LTTng brings to the table ... I know it is probably the tool of choice
> in modern kernels but I'm wondering if we would see any benefit of
> attempting to get it working with such an old kernel.
> 
> Regards,
> 
> Brian
> 
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> ltt-dev mailing list
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> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com

[ltt-dev] 2.6.12-rc4-mm2-lttng-0.4.3 vs LTT in MVista 2.6.10

[Mathieu Desnoyers]

* Brian Hutchinson (b.hutchman at gmail.com) wrote:
> I forgot to mention that my target is ARM 926 (DaVinci).  I found old
> versions of the compatibility list that showed 2.6.12 as first LTTng
> version.  Is this only for i386 or will it work for ARM?  I don't see
> ARM mentioned in the compatibility list until version 2.6.16 and
> 2.6.20 but it isn't clear if that is when ARM support started.

Nope, ARM was not supported back then. Don't expect too much from the
first LTTng ever released. ;)

> 
> Looking at the 2.6.12-lttng patch files ... I see portions that deal
> with ARM which makes me think it is supported?

I would not count on complete support.

Good luck :)

Mathieu

> 
> Example:
> 
> patch-2.6.12-rc4-mm2-lttng-0.4.3-instrumentation.diff
>   1 12:--- a/arch/arm/kernel/entry-common.S	(.../trunk/kernel/linux-2.6.12-rc4-mm2)	(revision
> 52)
>   2 12:+++ b/arch/arm/kernel/entry-common.S	(.../branches/mathieu/linux-2.6.12-rc4-mm2)	(revision
> 52)
>   42 13:Index: arch/arm/kernel/sys_arm.c
>   42 28:Index: arch/arm/kernel/sys_arm.c
> .
> .
> .
> 
> 
> Looks like my MVista 2.6.10 has Yuri's older LTT patch.
> 
> Regards,
> 
> Brian
> 
> _______________________________________________
> ltt-dev mailing list
> ltt-dev at lists.casi.polymtl.ca
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com