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Date: Fri, 06 Feb 2009 15:48:17 +0100
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai-help] How to check task activation ?
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To: Sebastien DI MERCURIO <sebastien.di-mercurio@domain.hid>
Cc: xenomai@xenomai.org

Sebastien DI MERCURIO wrote:
> Hello,
> =20
> 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 (namel=
y
TSWITCH). If you are running on top of the VxWorks skin, then the taskHoo=
kLib 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 sc=
heduler
hook. The hook routine would emit a record via a message pipe (RT_PIPE) f=
or each
event, which a plain Linux process would collect by reading on the user-s=
pace
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 wou=
ld
collect a lot of data, aside of the TSWITCH events. YMMV.

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

No.

> =20
> Best regards
> =20
> -----------------------------------------------------------------------=
-
> *S=E9bastien DI MERCURIO*
> DGEI - Bureau 108 - 1er =E9tage
> Institut National des Sciences Appliqu=E9es
> 135 Avenue de Rangueil, 31077, Toulouse cedex 4
> Tel: 05 61 55 98 34
> =20
>=20
>=20
> -----------------------------------------------------------------------=
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>=20
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--=20
Philippe.