netdev - Re: [PATCH RFC: linux-next 1/2] irq: Add CPU mask affinity hint callback framework

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Date:	Tue, 20 Apr 2010 19:28:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	peter.p.waskiewicz.jr@...el.com
Cc:	tglx@...utronix.de, arjan@...ux.jf.intel.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC: linux-next 1/2] irq: Add CPU mask affinity hint
 callback framework

From: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Date: Sun, 18 Apr 2010 21:57:41 -0700

> This patch adds a callback function pointer to the irq_desc
> structure, along with a registration function and a read-only
> proc entry for each interrupt.
> 
> This affinity_hint handle for each interrupt can be used by
> underlying drivers that need a better mechanism to control
> interrupt affinity.  The underlying driver can register a
> callback for the interrupt, which will allow the driver to
> provide the CPU mask for the interrupt to anything that
> requests it.  The intent is to extend the userspace daemon,
> irqbalance, to help hint to it a preferred CPU mask to balance
> the interrupt into.
> 
> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>

I'll leave it to the IRQ layer experts whether this is
appropriate or not, it doesn't look too bad to me.
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