linux-kernel - Re: [PATCH 0/4] hugetlb: add hugepagesnid= command-line option

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Message-ID: <20140211163108.3136d55a@redhat.com>
Date:	Tue, 11 Feb 2014 16:31:08 -0500
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, mtosatti@...hat.com, mgorman@...e.de,
	aarcange@...hat.com, riel@...hat.com
Subject: Re: [PATCH 0/4] hugetlb: add hugepagesnid= command-line option

On Tue, 11 Feb 2014 22:17:32 +0100
Andi Kleen <andi@...stfloor.org> wrote:

> On Mon, Feb 10, 2014 at 12:27:44PM -0500, Luiz Capitulino wrote:
> > HugeTLB command-line option hugepages= allows the user to specify how many
> > huge pages should be allocated at boot. On NUMA systems, this argument
> > automatically distributes huge pages allocation among nodes, which can
> > be undesirable.
> > 
> > The hugepagesnid= option introduced by this commit allows the user
> > to specify which NUMA nodes should be used to allocate boot-time HugeTLB
> > pages. For example, hugepagesnid=0,2,2G will allocate two 2G huge pages
> > from node 0 only. More details on patch 3/4 and patch 4/4.
> 
> The syntax seems very confusing. Can you make that more obvious?

I guess that my bad description in this email may have contributed to make
it look confusing.

The real syntax is hugepagesnid=nid,nr-pages,size. Which looks straightforward
to me. I honestly can't think of anything better than that, but I'm open for
suggestions.
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