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

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Date:	Sat, 19 Jun 2010 10:35:02 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Tejun Heo <tj@...nel.org>, mingo@...e.hu, tglx@...utronix.de,
	bphilips@...e.de, yinghai@...nel.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	jeff@...zik.org, linux-ide@...r.kernel.org,
	stern@...land.harvard.edu, gregkh@...e.de, khali@...ux-fr.org
Subject: Re: [PATCH 09/12] irq: implement IRQ expecting

Arjan van de Ven <arjan@...radead.org> writes:

> On Sun, 13 Jun 2010 17:31:35 +0200
> Tejun Heo <tj@...nel.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...

I'm not sure it's really that useful to power optimize
the lost interrupts polling case. It's just a last resort
fallback anyways and will be always less power efficient
because there will be unnecessary polls.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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