Chris Friesen wrote: > Gregory Haskins wrote: >> Hi Ingo, Steven, Peter, >> This series applies roughly to mainline as an enhancement to the >> sched_rt >> logic. Peter and I were discussing some of the unecessary overhead in >> pull_rt_tasks() via IRC, and this is my RFC attempt to address the >> problem. >> >> I have built/booted this on a 4-way C2D Xeon box and it passes >> preempt-test. > > At first blush it looks reasonable, but do you have any performance > numbers? Hi Chris, That is a perfectly reasonable request, but unfortunately I do not have any at this time. Its currently all based on the observation that pull_rt_tasks() can cause excessive rq->lock contention and the theory that this should reduce the cases where that happens. It still needs to be proven and quantified, outside of the basic litmus test I gave it before posting. I will try to get to this ASAP. Regards, -Greg
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