From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Sun, 08 Jul 2007 14:00:28 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] accessing context switch counter from rttask
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To: Gsellmann Peter <Peter.Gsellmann@domain.hid>
Cc: xenomai@xenomai.org

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Jan Kiszka wrote:
> Gsellmann Peter wrote:
>> Hi!
>>
>> I searched for a while and found this snippet
>>
>> RT_TASK *rt =3D rt_task_self();
>> int x =3D rt->thread_base.stat.csw;
>>
>> should give the number of context switches, but:
>> RT_TASK in non-kernel mode is only RT_TASK_PLACEHOLDER so i have no
>> access to thread_base!
>>
>> Is there an official way to get this info (w/o opening
>> "/proc/xenomai/...")?
>>
>=20
> Not yet. You could extend RT_TASK_INFO with this statistic (obtained vi=
a
> rt_task_inquire). There is currently work in progress to add accumulate=
d
> execution times to the same interface, so this extension would fit quit=
e
> well. Patches always welcome.

Meanwhile, I added this feature to my experimental patch stack while
integrating some other new stats. See

http://www.rts.uni-hannover.de/rtaddon/patches/xenomai/

against Xenomai SVN trunk, namely

http://www.rts.uni-hannover.de/rtaddon/patches/xenomai/enhance-thread-sta=
ts.patch

Just call rt_task_inquire() and check RT_TASK_INFO::ctxswitches (there
are modeswitches and pagefaults too as we are already at it).

Feedback welcome!

Jan


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