Message-ID: <4B0BF0CA.5020600@linux.intel.com>
Date: Tue, 24 Nov 2009 06:42:18 -0800
From: Arjan van de Ven <arjan@linux.intel.com>
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To: Peter Zijlstra <peterz@infradead.org>
CC: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>,
       Yong Zhang <yong.zhang0@gmail.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "arjan@linux.jf.intel.com" <arjan@linux.jf.intel.com>,
       "davem@davemloft.net" <davem@davemloft.net>,
       "netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance
 hints
References: <20091123064630.7385.30498.stgit@ppwaskie-hc2.jf.intel.com>	 <2674af740911222332i65c0d066h79bf2c1ca1d5e4f0@mail.gmail.com>	 <1258968980.2697.9.camel@ppwaskie-mobl2> <1258995923.4531.715.camel@laptop>	  <4B0B782A.4030901@linux.intel.com> <1259051986.4531.1057.camel@laptop>
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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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