Re: [Xenomai-help] How to check task activation ?

[Philippe Gerum <rpm@xenomai.org>]

Sebastien DI MERCURIO wrote:
> Hello,
>  
> Is there a way to get task scheduling log in xenomai ? Something like a
> log in /proc/xenomai, telling which task was activated at which time,
> and then which other task was activated .... would be fine?
>

No. You can do it yourself using the task callouts in kernel space (namely
TSWITCH). If you are running on top of the VxWorks skin, then the taskHookLib is
available from kernel space. If you are running on top of the native API,
rt_task_add_hook() is an equivalent. The idea would be to create a small module
using the native API in kernel space as well, that registers a TSWITCH scheduler
hook. The hook routine would emit a record via a message pipe (RT_PIPE) for each
event, which a plain Linux process would collect by reading on the user-space
end of the pipe.

Note: this will obviously cause overhead.

The other option is to either use LTTng or the I-pipe tracer, but you would
collect a lot of data, aside of the TSWITCH events. YMMV.

> Other point: is there some kind of monitoring tool (a bit like windriver
> Windview) working on xenomai ?

No.

>  
> Best regards
>  
> ------------------------------------------------------------------------
> *Sébastien DI MERCURIO*
> DGEI - Bureau 108 - 1er étage
> Institut National des Sciences Appliquées
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>  
> 
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-- 
Philippe.