linux-kernel - Re: [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support

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Date:	Fri, 15 Jun 2007 10:05:59 -0500
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <clameter@....com>, linux-kernel@...r.kernel.org,
	hch@...radead.org
Subject: Re: [patch 00/14] Page cache cleanup in anticipation of Large
	Blocksize support

On Thu, 2007-06-14 at 15:04 -0700, Andrew Morton wrote:
> > On Thu, 14 Jun 2007 14:37:33 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:
> > On Thu, 14 Jun 2007, Andrew Morton wrote:
> > 
> > > We want the 100% case.
> > 
> > Yes that is what we intend to do. Universal support for larger blocksize. 
> > I.e. your desktop filesystem will use 64k page size and server platforms 
> > likely much larger.
> 
> With 64k pagesize the amount of memory required to hold a kernel tree (say)
> will go from 270MB to 1400MB.   This is not an optimisation.
> 
> Several 64k pagesize people have already spent time looking at various
> tail-packing schemes to get around this serious problem.  And that's on
> _server_ class machines.  Large ones.  I don't think
> laptop/desktop/samll-server machines would want to go anywhere near this.

I'm one of the ones investigating 64 KB pagesize tail-packing schemes,
and I believe Christoph's cleanups will reduce the intrusiveness and
improve the readability of a tail-packing solution.  I'll add my vote in
support of these patches.

Thanks,
Shaggy
-- 
David Kleikamp
IBM Linux Technology Center

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