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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-15

    * Mark_H_Johnson@raytheon.com <Mark_H_Johnson@raytheon.com> wrote:

    > [3] Some traces show information on both CPU's and then a long period
    > with no traces from the other. Here is an example...

    > <unknown-2847 1d.h. 4µs : rebalance_tick (scheduler_tick)
    > <unknown-2847 1d.h. 5µs : irq_exit (apic_timer_interrupt)
    > <unknown-2847 1d... 5µs < (0)

    > ... no more traces from CPU 1 ...

    PID 2847 returned to userspace at timestamp 5µs. Userspace then can take
    an arbitrary amount of time until it calls the kernel again.

    Ingo
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