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SubjectRe: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U3

* Ingo Molnar <mingo@elte.hu> wrote:

> a suggestion for future testing: please enable PREEMPT_TIMING for the
> next kernels you build, it will print such entries at the end of
> stacktraces:
>
> preempt count: 2
> entry 1: cpu_idle+0x38/0x90 / (start_kernel+0x1ac/0x1f0)
> entry 2: _spin_lock+0x22/0x80 / (timer_interrupt+0x1b/0x130)

correction: in -U3 you'll also need to enable LATENCY_TRACE for this to
work. I've fixed this in my tree and from -U4 onwards the preemption
trace will be maintained and printed if DEBUG_PREEMPT is enabled.

Ingo
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