Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>> Jan Kiszka wrote:
>>> Andreas Glatz wrote:
>>>> Hi Philippe,
>>>>
>>>> At the Xenomai Users Meeting last year I asked you if Xenomai would offer
>>>> a possibility to lower the priority of certain Xenomai tasks below that of
>>>> Linux. We need this feature since we have tasks in our RT application
>>>> which should only run when Linux is idle (A statistics collection task
>>>> which part of the RT application and hard to isolate from this
>>>> application).
>>>>
>>> What prevents using a borderline thread (if you need to interact with
>>> blocking Xenomai services) with SCHED_OTHER and a Linux nice level of 19?
>> Well, this does not really guarantee that the thread will run only when
>> linux is idle. The thread will eat some cpu time, the nice level is not
>> a strict priority, as you know.
>
> Where do you really need anything stricter? It's the opposite of "I need
> true 100% CPU for my task, and that forever."
>
>> But in fact, I wonder why Andreas wants
>> a new scheduling policy for xenomai, what is needed, is simply a
>> SCHED_IDLE (maybe it exists ?!) policy for Linux.
>>
>
> There is no such thing AFAIK. If you are concerned that some CPU
> intensive low prio job eats too much CPU, you normally reduce its
> nice-level and/or confine its CPU bandwidth via cgroups.
SCHED_IDLE exists.
--
Gilles.
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