linux-kernel - Re: [PATCH 03/10] mm: tag reseve pages

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Date:	Mon, 6 Aug 2007 14:38:42 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Miller <davem@...emloft.net>,
	Daniel Phillips <phillips@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Steve Dickson <SteveD@...hat.com>
Subject: Re: [PATCH 03/10] mm: tag reseve pages

On Mon, Aug 06, 2007 at 12:10:53PM -0700, Andrew Morton wrote:
> On Mon, 6 Aug 2007 20:59:26 +0200 Andi Kleen <andi@...stfloor.org> wrote:
> 
> > > precious page flag
> > 
> > I always cringe when I hear that. It's really more than node/sparsemem
> > use too many bits. If we get rid of 32bit NUMA that problem would be
> > gone for the node at least because it could be moved into the mostly
> > unused upper 32bit part on 64bit architectures.
> 
> Removing 32-bit NUMA is attractive - NUMAQ we can probably live without,
> not sure about summit.  But superh is starting to use NUMA now, due to
> varying access times of various sorts of memory, and one can envisage other
> embedded setups doing that.
> 
> Plus I don't think there are many flags left in the upper 32-bits.  ia64
> swooped in and gobbled lots of them, although it's not immediately clear
> how many were consumed.
> 
> > The alternative would be to investigate again what it does to the
> > kernel to just use different lookup methods for this.
> 
> That's cringeworthy too, I expect.

Perhaps the node info could be pulled out into a parallel and
effectively read-only array of shorts.

-- 
Mathematics is the supreme nostalgia of our time.
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