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SubjectRe: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator driver
Pavel Machek wrote:
>> Pavel Machek wrote:
>>>> Another relevant point is that I will be adding a bit more functionality
>>>> to disable the timer interrupt on truly "idle" cpus (like have been idle
>>>> for some amount of seconds). We would then use the "exit from idle"
>>>> callback to reestablish the timer interrupt. [This would allow them to
>>>> enter power down states if appropriate.]
>>> Should you look at nohz instead of reinventing it?
>> Thanks, I did look at it. Quite complex. Maybe I'm missing something
>> but I don't see how it fits in? Are you saying I should be using
>
> I seen your remark above about disabling timer interrupt on idle
> cpus. That's exactly nohz functionality, right? Maybe I misunderstood
> you and you meant "my monitoring interrupt" and not "generic system
> timer interrupt"?
>
> Pavel

Ahh, yes, now I see... ;-)

And thanks for the pointer, I hadn't looked at this before.

In regards to "powering down" a UV system, it's not clear yet that it will
help much unless we can power down a whole lot more of the system than just
the cpus... ;-) [but in reality, reducing power use any time you can is
real necessity.]

Btw, are you ok with the remainder of the patch?

Thanks,
Mike


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