Messages in this thread | | | Date | Thu, 02 Oct 2008 07:33:44 -0700 | From | Mike Travis <> | Subject | Re: [PATCH 1/1] SGI X86 UV: Provide a System Activity Indicator driver |
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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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