> This second patch is just a small optimization to the code calling
> the scheduling code. With a program like rc5des running (nice +19)
> in the background and NOTHING in the foreground Linux still goes
> through the scheduler 50 times a second!
hm, it should only go 5 times a second into the scheduler if this is the
only process running. Are you sure that it's 50 times a second? With 5
times a second and 5 usecs per schedule(), it's 0.000025 seconds per 1.0
second overhead, acceptable i think. (also, there is a small bug in your
patch, you should hold the runqueue spinlock if you rely on nr_running)
-- mingo
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