If you want the best available soft real-time on 2.6.22, there's a few
patches from various people that aren't in standard kernels.
The only one I know about for 2.6.2x is Ingo Molnar et al's
RT-preemption patch set, which moves things like interrupts and soft
interrupts into their own process contexts, so high real-time priority
processes can still run ahead of them if appropriate, with priority
inheritance on locks to prevent deadlocks, and which makes more locked
regions in the kernel pre-emptible by higher priority processes to
reduce the time in critical sections.
I learned that
as of 2.6.22 "most" RT patches are integrated in the standard. I
supposed that this includes Ingo Molnar et al's RT-preemption patch set.
Supposedly soon, I'll be working with µCLinux 2.6.23 on NIOS
architecture. I understand that some of the patches are architecture
specific and originally available just for x86. Maybe some work is
necessary here.
-Michael
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