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

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Message-ID: <20140212103924.GO6732@suse.de>
Date:	Wed, 12 Feb 2014 10:39:24 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Marcelo Tosatti <mtosatti@...hat.com>
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 06:15:57PM -0200, Marcelo Tosatti wrote:
> 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?
> 

There is no guarantee anyway and early in the lifetime of the system there
is going to be very little difference in success rates. In case there is a
misunderstanding here, I'm not looking to NAK a series that adds another
kernel parameter. If it was me, I would have tried runtime allocation
first to avoid adding a new interface but it's a personal preference.

-- 
Mel Gorman
SUSE Labs
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