linux-kernel - Re: [PATCH 15/19] mm: numa: Add fault driven placement and migration

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Date:	Tue, 13 Nov 2012 14:39:13 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 15/19] mm: numa: Add fault driven placement and migration


* Mel Gorman <mgorman@...e.de> wrote:

> > The NUMA_VARIABLE_LOCALITY name slightly misses the real 
> > point though that NUMA_EMBEDDED tried to stress: it's 
> > important to realize that these are systems that (ab-)use 
> > our NUMA memory zoning code to implement support for 
> > variable speed RAM modules - so they can use the existing 
> > node binding ABIs.
> > 
> > The cost of that is the losing of the regular NUMA node 
> > structure. So by all means it's a convenient hack - but the 
> > name must signal that. I'm not attached to the NUMA_EMBEDDED 
> > naming overly strongly, but NUMA_VARIABLE_LOCALITY sounds 
> > more harmless than it should.
> > 
> > Perhaps ARCH_WANT_NUMA_VARIABLE_LOCALITY_OVERRIDE? A tad 
> > long but we don't want it to be overused in any case.
> > 
> 
> I had two reasons for not using the NUMA_EMBEDDED name.

As I indicated I'm fine with not using that.

> I'll go with the long name you suggest even though it's arch 
> specific because I never want point 2 above to happen anyway. 
> Maybe the name will poke the next person who plans to abuse 
> NUMA in the eye hard enough to discourage them.

FYI, I've applied a slightly shorter variant in the numa/core 
tree, will send it out later today.

Thanks,

	Ingo
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