Re: AW: [Xenomai-help] delete queues "offline"; /proc/stat

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

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Roderik_Wildenburg@domain.hid wrote:
>>> when a xenomai-task crashs which created some queues 
>>> (rt_queue_create) 
>>> and I try to restart the task the creation of the queues 
>>> will fail as 
>>> the queue still exists (error EEXIST == 17). Is there a 
>>> possibility to 
>>> see which queues exist (I did not find a hint in the /proc/xenomai
>>> directory) and to get rid of these queues (or geneally 
>>> spoken : to get 
>>> rid of allocated resources) e.g. with a commandline tool ?
> 
>> Native or posix skin? Gilles added per-process resource 
>> cleanup to the posix skin in 2.2-rc3.
>>
> 
> following Murphys law, I, of course, use native skin where this mechanism isn?t 
> implemented yet ;-)
> What does "per-process resource cleanup" mean ? 
> When the process/thread is killed the queues and other resources of this 
> process/thread are deleted automaticaly ?

Exactly.

> 
>> Otherwise: the names should be found in 
>> /proc/xenomai/registry. Writing a tiny tool to pick up a name 
>> and resources type, attach to it, and then release it should 
>> be straightforward. But I think we will have per-process 
>> cleanup also for other skins in the future.
>>
> 
> The trick with this is the attachement with the resource.
> I can?t see a way to attach to a queue whos handle (RT_QUEUE)
> is lost (it can?t be reconstructed out of the data from the 
> registry).  Are there some other "tricks" ?

If there is a name registered, rt_queue_bind() should do the trick - but
that's pure theory, I may oversee some detail ATM.

> 
> 
>> Stalled RTDM descriptors can be released via "echo DESCR_NO > 
>> /proc/xenomai/rtdm/open_fildes" (I still have to make use of Gilles'
>> per-process cleanup also for the posix rtdm part...).
>>
>>> An other question, I would appreciate some help for, is :
>>> How could I determine the CPU-load when a xenomai thread is 
>> running? 
>>> Is the data provided by /proc/stat valid with xenomai ?
>> Nope, they aren't. We actually need to do something in this 
>> direction, maybe a simple per-xeno-thread execution time 
>> accounting if XENO_OPT_STATS is set.
>>
> 
> A summary of Xenomai used time in /proc/stat would be fine too:
> CPU : "User time" "nice time" "system time" "xenomai time" "idle time".
> But this probably is not compatible.
> 

I've just hacked a patch for per-thread stats. Seems to work. I will
post it in a few minutes on xenomai-core together with some explanations
and suggestions. Stay tuned!

Jan


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