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    SubjectRe: [RFC] Thread Migration Preemption
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    On Fri, 2007-07-06 at 10:34 -0400, Steven Rostedt wrote:

    > thing is that in RT an IRQ thread might service a softirq if that
    > softirq thread is of the same priority as the IRQ thread. The difference
    > between an IRQ thread and a softirq thread is that the IRQ thread may
    > migrate but the softirq thread may not. So to do this performance
    > enhancement, we need to temporarily pin the IRQ thread to the CPU, which
    > is expensive (set_cpus_allowed). This would make it much simpler and
    > light weight to implement.

    Are there any other reasons?

    Daniel

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