Re: High priority tasks break SMP balancer?

[Christoph Lameter]

On Thu, 15 Nov 2007, Micah Dowty wrote:

> For reference, the exact test I used with git-bisect is attached. The
> C program (priosched) starts two busy-looping threads and a
> high-priority high-frequency thread which uses relatively little
> CPU. The Python program repeatedly starts the C program, runs it for a
> half second, and measures the resulting imbalance in CPU usage. On
> kernels prior to the above commit, this reports values within about
> 10% of 1.0. On later kernels, it crashes within a couple iterations
> due to a divide-by-zero error :)

The kernel crashes? Sounds like your application crashes with a divide by 
zero?


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