powerd adaptive mode latching

[Nate Lawson]

Stefan Lambrev wrote:
> Nate Lawson wrote:
>> I am not sure this patch should be committed as-is.  It might be better
>> centralized in the cpufreq mid-layer so that all drivers benefit instead
>> of just acpi_perf.  If there are frequencies that are too close to each
>> other (no matter what the source driver), it might be good to eliminate
>> them.
>>
>> I'll look into it later today.
>>
>> -Nate
>>   
> I fully agree that centralized solution is better.
> But at this late stage of RELENG_7_0, I'm happy with this patch, as it
> solves our problem and is very simple.
> If you can come with something better before 7-RELEASE, it's OK, but
> otherwise I think we should have this patch in the CVS and then
> RELENG_7_0 (even marked as XXX)
> 
> The other patch actually is in powerd.c and with it doesn't matter what
> is the source of the information, but I personally, more like the
> acpi_perf patch :)

Some of us have other jobs that have nothing to do with FreeBSD.
Anyway, attached is the patch (compile tested).  You should test without
the acpi_perf patch to be sure it is functionally equivalent.

Thanks
Nate
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