Uwe Kleine-König a écrit :
On Mon, Jul 27, 2009 at 01:57:31PM +0200, Denis Richard wrote:
Hi all,
We work on powerpc board with kernel 2.6.29.6-rt23.
The kernel is configured with "Complete Preemption (Real-Time)".
Working on our software, we have a strange behavior.
A real time thread (SCHED_RR) can be preempted by non real time one
(SCHED_OTHER).
We wrote a little test program (at the end of this mail).
This program creates 2 threads, a SCHED_RR one which processes during
about 12s
(long for a real time, but just for test), and a SCHED_OTHER one,
started after the first one,
which just modifies a global variable. The second one should not run
during the execution of
the first one. But it appends, the global variable is modified.
rr_other
Create thread
OTHER ran during RR
The end
Is it normal, a non real time thread preempts a real time one ? (we
think, it is not)
Or is there something wrong in the test program, the kernel
configuration, ... ?
Does
# echo -1 > /proc/sys/kernel/sched_rt_runtime_us
help?
Yes, it solves the problem.
Thanks Uwe.
Regards
Denis
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