linux-kernel - Re: [patch] Add allowed_affinity to the irq_desc to make it possible to have restricted irqs

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Date:	Wed, 13 Dec 2006 21:19:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] Add allowed_affinity to the irq_desc to make it possible to have restricted irqs


* Eric W. Biederman <ebiederm@...ssion.com> wrote:

> > also there might be hardware that can only route a given IRQ to a 
> > subset of CPUs. While setting set_affinity allows the 
> > irqbalance-daemon to 'probe' this mask, it's a far from optimal API.
> 
> I agree, I am just arguing that adding another awkward interface to 
> the current situation does not really make the situation better, and 
> it increases our support burden.

well, please suggest a better interface then.

> For a bunch of this it is arguable that the way to go is simply to 
> parse the irq type in /proc/interrupts.  All of the really weird cases 
> will have a distinct type there.  This certainly captures the MSI-X 
> case.  There is still a question of how to handle the NUMA case but...

... so parsing /proc/interrupts should be that interface? That is a 
historically very volatile interface. It's mostly human-parsed, and we 
frequently twiddle it - genirq changed it too. In v2.6.19 we had fasteio 
instead of fasteoi there.

	Ingo
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