linux-kernel - Re: [RFC,1/2] powerpc/numa: fix cpu_to

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Message-ID: <alpine.DEB.2.10.1507081823060.16585@chino.kir.corp.google.com>
Date:	Wed, 8 Jul 2015 18:24:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
cc:	Michael Ellerman <mpe@...erman.id.au>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC,1/2] powerpc/numa: fix cpu_to_node() usage during boot

On Wed, 8 Jul 2015, Nishanth Aravamudan wrote:

> > It looks like the symptom is that the per-cpu areas are all allocated on node
> > 0, is that all that goes wrong?
> 
> Yes, that's the symptom. I cc'd a few folks to see if they could help
> indicate the performance implications of such a setup -- sorry, I should
> have been more explicit about that.
> 

Yeah, not sure it's really a bugfix but rather a performance optimization 
since cpu_to_node() with CONFIG_USE_PERCPU_NUMA_NODE_ID is only about 
performance.
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