Re: [Xenomai-help] Xenomai LTTng support

[Jan Kiszka <jan.kiszka@domain.hid>]

Andreas Glatz wrote:
> Hi,
> 
> On Fr. I got lttng (without Jan's patch) working 
> for my HW/SW-Configuration:
> 
> Linux: (Debian) Kernel 2.6.26
> Xenomai: 2.4.4
> Target: powerpc
> lttng kernel patch: patch-2.6.26.1-0.15.tar.bz2
> ltt control: ltt-control-0.50-17072008.tar.gz
> lttv: lttv-0.10.0-pre14-17072008.tar.gz
> 
> Configuration steps:
> 1) Applied Xenomai patch
> 2) Applied a bunch of other patches required to control our HW
> 3) Applied lttng patch
> 4) Configured and build the Kernel (see attached config file)
> 5) Build ltt-control for our target (powerpc) and lttv for my host (x86)
> 
> After installing the kernel and ltt-control I booted the 
> Kernel followed by:
> 
> 1) ltt-armall
> 2) lttctl -n trace -d -l /sys/kernel/debug/ltt -t /root/huhu
> 3) Started our Xenomai user-space application...
> 4) lttctl -n trace -R # Stops tracing
> 5) Transferred /root/huhu to my host and visualized it with lttv
> 
> Next step will be that I'll try to apply Jan's patch... although I
> haven't yet figured out why I would need it exactly...

The major issue are RT safe markers (so that you can also use them over
Xenomai tasks and interrupts). That depends a bit on the arch-specific
implementation (don't know the latest state /wrt PowerPC). See
http://git.kiszka.org/?p=ipipe-2.6.git;a=commitdiff;h=a3f9c39e4df84f0dd5976db1ab7ae6f14bf861ce
for what changes on x86 and what generic bits are required. The rest was
more or less mechanical conflict resolution.

Jan

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