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

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Message-ID: <20140211201557.GA16281@amt.cnet>
Date:	Tue, 11 Feb 2014 18:15:57 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	David Rientjes <rientjes@...gle.com>,
	Luiz Capitulino <lcapitulino@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 0/4] hugetlb: add hugepagesnid= command-line option

On Tue, Feb 11, 2014 at 05:10:35PM +0000, Mel Gorman wrote:
> On Tue, Feb 11, 2014 at 01:26:29PM -0200, Marcelo Tosatti wrote:
> > > Or take a stab at allocating 1G pages at runtime. It would require
> > > finding properly aligned 1Gs worth of contiguous MAX_ORDER_NR_PAGES at
> > > runtime. I would expect it would only work very early in the lifetime of
> > > the system but if the user is willing to use kernel parameters to
> > > allocate them then it should not be an issue.
> > 
> > Can be an improvement on top of the current patchset? Certain use-cases
> > require allocation guarantees (even if that requires kernel parameters).
> > 
> 
> Sure, they're not mutually exclusive. It would just avoid the need to
> create a new kernel parameter and use the existing interfaces.

Yes, the problem is there is no guarantee is there?


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