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SubjectRe: SCHED_FIFO & system()
I forgot to add one important detail - the Kernel is configured as -
Preemptible Kernel (Low-Latency Desktop).

Cheers // Matias skrev:
> Hello,
> I have some strange behavior in one of my systems.
> I have a real-time kernel thread under SCHED_FIFO which is running every
> 10ms.
> It is blocking on a semaphore and released by a timer interrupt every 10ms.
> Generally this works really well.
> However, there is a module in the system that makes a / system() / call
> from c-code in user-space;
> system("run_my_script");
> By calling and running a bash script. Independent of how the actual
> script looks like the real time kernel thread does not get scheduled under
> the time of 80ms -- the time it takes for the system() call to finish.
> I can see when running a LTT session that the wake_up event occurs for
> the real time thread 10ms into the system call but nevertheless the real
> time kernel thread does not get scheduled.
> The thread that calls system("run_my_script") is configured as SCHED_OTHER.
> The Kernel is 2.6.21.
> Anybody who recognize this or similar situations?
> Cheers // Matias
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