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

[Ingo Molnar]

* Mark_H_Johnson@xxxxxxxxxxxx <Mark_H_Johnson@xxxxxxxxxxxx> 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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