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 20:43:32 +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:

> In addition the cases I can think of allowed_affinity is the wrong 
> name.  suggested_affinity sounds like what you are trying to implement 
> and when it is merely a suggestion and not a hard limit it doesn't 
> make sense to export like this.

well, there are interrupts that must be tied to a single CPU and must 
never be moved away. For example per-CPU clock-events-source interrupts 
are such. So allowed_affinity very much exists.

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.

	Ingo
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