Re: [perfmon] Re: [perfmon2] perfmon2 merge news

[Andi Kleen]

On Tue, Nov 13, 2007 at 01:13:45PM -0800, Stephane Eranian wrote:
> Oprofile does not setup the PMU interrupt. It builds on top of the NMI watchdog
> setup.

Oprofile works without the NMI watchdog too, but it just happens to be another
NMI user.

> It uses the register_die() mechanism, 

Not correct.

> if I recall. The low level APIC
> and gate is setup elsewhere. Perfmon does not use NMI, unless forced to because
> of the NMI watchdog. 

It could handle it in the same way as oprofile if it wanted. But given
NMIs make everything more complicated and it might not be worth it.

-Andi
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