Re: SCHED_RR/SCHED_FIFO and kernel threads?

[Chris Friesen]

Patrik Hägglund wrote:

> Kernel threads seems to generally be scheduled in the SCHED_OTHER class 
> (with the 'migration' thread as an exception).

This is on purpose.  The idea is that realtime processes get all the 
time they request.  If the kernel threads are interrupting the realtime 
app, then the latency of the realtime app is degraded.

> As I see it, "kernel activity" shall not be starved by user-space 
> processes. Therefore, I was very suprised by this behaviour when I saw 
> it in 2.6.11.

If you want specific kernel threads to take priority, you can always 
manually make then SCHED_RR/SCHED_FIFO yourself.

Chris
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