Re: Minor page faults from pthread_create() aka still problems with 3.0.12-rt30

["Tim Sander" <tim.sander@hbm.com>]

Hi
> Simply running the example causes roughly 30 minor page faults. When I
> manually allocate stack memory for the stack (after mlockall() and
> mallopt have been called) and use pthread_attr_setstack() before calling
> pthread_create(), minor page faults drop to 2.
> 
> Does anybody happen to know what is causing these remaining two page
> faults? My only guess so far is kernel memory to hold some
> organizational data for the new thread after clone() has been invoked,
> but this could also be completely wrong.
> 
> Note that I don't need to get page faults down to 0, I'm only looking
> for an explanation to understand the issue at hand to confirm that
> pthread_create() must not be used from an RT context.
While unfortunatly i can't help i've got the impression that something is 
still strange with 3.0.12pmx-rt30. (This is on a arm i.mx35 with some 
platform adaptations and a cyclic clock interrupt.). I haven't build a newer 
version of 3.0-rt yet.

See my mail where i describe this problem here.
https://lkml.org/lkml/2011/12/7/657

I am ocasionally also seeing a ksoftirqd/0 running on as much cpu as it gets.
This is always when i see the message: sched: RT throttling activated

Not the best start into the new year :-(.

Best regards
Tim

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