linux-kernel - Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance hints

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Message-ID: <4B0BF0CA.5020600@linux.intel.com>
Date:	Tue, 24 Nov 2009 06:42:18 -0800
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Yong Zhang <yong.zhang0@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arjan@...ux.jf.intel.com" <arjan@...ux.jf.intel.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance
 hints

Peter Zijlstra wrote:
>>> Same for userspace.
>> the problem is that there is no way currently that the driver can communicate
>> "I allocated all my metadata on THIS numa node". irqbalance and sysadmins need
>> that to not make really stupid decisions.....
> 
> And what exactly is struct device::numa_node good for then?
> 

and that is exported to userspace.. how?

... that has nothing to do with an irq, and also falls flat for a driver that
supports multiple irqs, and assigns one to each numa node.


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