Well, Ingo's patch didn't made any difference for my problem with kernel
starvation.
As expected, the workaround of raising the priority of the 'events'
kernel thread made it possible to switch VT or switch windows in X (as
described in my first mail), when running a simple infinite loop. When
running arbitrary programs, I expect that all kernel threads needs
higher priority.
I guess that the point with kernel threads is to push heavy kernel
requests "backwards in the queue", thereby lowering the mean latency for
SHED_OTHER processes. Therefore, using high priorities for kernel
threads was not an option. However, this comes at the price of breaking
SCHED_FIFO/SCHED_RR.
The only clean solution is probably to have priorities that are reserved
for kernel threads. I saw that kernel threads in LynxOS may use a
priority of 1/2 above of the user-space tasks it serves. This seems like
a good solution to the problem.
Any other patches out there, ready for a test?
/Patrik Hägglund
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