Re: [PATCH 09/12] irq: implement IRQ expecting

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From: Thomas Gleixner

Subject: Re: [PATCH 09/12] irq: implement IRQ expecting

Date: Thursday, June 17, 2010 - 4:12 am

On Thu, 17 Jun 2010, Tejun Heo wrote:

quoted text> Hello, Arjan.
> 
> On 06/17/2010 05:48 AM, Arjan van de Ven wrote:
> > On Sun, 13 Jun 2010 17:31:35 +0200
> > Tejun Heo <tj@kernel.org> wrote:
> >> + */
> >> +void expect_irq(struct irq_expect *exp)
> > 
> > I would like to suggest an (optional) argument to this with a duration
> > within which to expect an interrupt....
> > 
> > that way in the backend we can plumb this also into the idle handler
> > for C state selection...
> 
> Hmmm.... oh, I see.  Wouldn't it be much better to use moving avg of
> IRQ durations instead of letting the driver specify it?  Drivers are
> most likely to just hard code it and It's never gonna be accurate.

Right, but that's probably more accurate than the core code heuristics
ever will be.

Thanks,

	tglx
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Messages in current thread:

[PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Sun Jun 13, 8:31 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Jiri Slaby, (Mon Jun 14, 2:21 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Mon Jun 14, 2:43 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Mon Jun 14, 2:46 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Arjan van de Ven, (Wed Jun 16, 8:48 pm)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Thu Jun 17, 1:18 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Thomas Gleixner, (Thu Jun 17, 4:12 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Thu Jun 17, 4:23 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Alan Cox, (Thu Jun 17, 4:43 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Thu Jun 17, 8:54 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Arjan van de Ven, (Thu Jun 17, 9:02 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Thu Jun 17, 9:47 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Arjan van de Ven, (Thu Jun 17, 11:26 pm)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Fri Jun 18, 2:23 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Thomas Gleixner, (Fri Jun 18, 2:45 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Andi Kleen, (Sat Jun 19, 1:35 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Sat Jun 19, 1:42 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Andi Kleen, (Sat Jun 19, 2:00 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Tejun Heo, (Sat Jun 19, 2:03 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Arjan van de Ven, (Sat Jun 19, 7:54 am)

Re: [PATCH 09/12] irq: implement IRQ expecting, Andi Kleen, (Sat Jun 19, 12:49 pm)

Re: [PATCH 09/12] irq: implement IRQ expecting, Arjan van de Ven, (Sat Jun 19, 1:07 pm)

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