Re: [patch] latency tracer, 2.6.15-rc7

[Ingo Molnar]

* Lee Revell <rlrevell@xxxxxxxxxxx> wrote:

> It seems that debug_smp_processor_id is being called a lot, even 
> though I have a UP config, which I didn't see with the -rt kernel:

do you have CONFIG_DEBUG_PREEMPT enabled? (if yes then disable it)

> Was this optimized out on UP before?

no, because smp_processor_id() debugging is useful on UP too: it checks 
whether smp_processor_id() is every called with preemption enabled, and 
reports such bugs.

	Ingo
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