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Date: Mon, 09 Sep 2002 13:08:34 -0700
From: Andrew Morton <akpm@digeo.com>
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To: Ingo Molnar <mingo@elte.hu>
CC: Zwane Mwaikambo <zwane@mwaikambo.name>,
       Linus Torvalds <torvalds@transmeta.com>, Robert Love <rml@tech9.net>,
       Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH][RFC] per isr in_progress markers
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Ingo Molnar wrote:
> 
> On Mon, 9 Sep 2002, Zwane Mwaikambo wrote:
> 
> > As an aside, i just had an idea for another way to improve interrupt
> > handling latency. Instead of walking through all the isrs in the chain,
> > we can have an isr flag wether it was the source of the irq, and if so
> > we stop right there and not walk through the other isrs. Obviously
> > taking into account that some devices are dumb and have no real way of
> > determining.
> 
> this is something i have a 0.5 MB patch for that touches a few hundred
> drivers. I can dust it off if there's demand - it will break almost
> nothing because i've done the hard work of adding the default 'no work was
> done' bit to every driver's IRQ handler.
> 

Does that code re-order the chain dynamically?

(My laptop shares an interrupt between the cardbus controller
and the cardbus ethernet controller.  The ethernet controller
generates 1000 interrupts per second.  The cardbus controller
generates 2 interrupts per day.  yenta_interrupt is really, really
slow).
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