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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