linux-kernel - Re: [PATCH 4/4] hugetlb: add hugepages

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Message-ID: <alpine.DEB.2.02.1402201516140.30647@chino.kir.corp.google.com>
Date:	Thu, 20 Feb 2014 15:17:55 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
cc:	Luiz Capitulino <lcapitulino@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>, davidlohr@...com,
	isimatu.yasuaki@...fujitsu.com, yinghai@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 4/4] hugetlb: add hugepages_node= command-line option

On Thu, 20 Feb 2014, Marcelo Tosatti wrote:

> > I'm not sure it's interesting to talk about since this patchset is 
> > unnecessary if you can do it at runtime, but since "hugepagesz=" and 
> > "hugepages=" have existed for many kernel releases, we must maintain 
> > backwards compatibility.  Thus, it seems, the easiest addition would have 
> > been "hugepagesnode=" which I've mentioned several times, there's no 
> > reason to implement yet another command line option purely as a shorthand 
> > which hugepage_node=1:2:1G is and in a very cryptic way.
> 
> There is one point from Davidlohr Bueso in favour of the proposed
> command line interface. Did you consider that aspect?
> 

I did before he posted it, in 
http://marc.info/?l=linux-kernel&m=139267940609315.  I don't think "large 
machines" open up the use case for 4 1GB hugepages on node 0, 12 2MB 
hugepages on node 0, 6 1GB hugepages on node 1, 24 2MB hugepages on node 
1, 2 1GB hugepages on node 2, 100 2MB hugepages on node 3, etc.
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