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Date: Tue, 06 Aug 2002 19:57:07 -0700
From: Andrew Morton <akpm@zip.com.au>
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To: Anton Blanchard <anton@samba.org>
CC: William Lee Irwin III <wli@holomorphy.com>, linux-kernel@vger.kernel.org,
       riel@surriel.com
Subject: Re: fix CONFIG_HIGHPTE
References: <20020806231522.GJ6256@holomorphy.com> <3D506D43.890EA215@zip.com.au> <20020807010752.GC6343@krispykreme>
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Anton Blanchard wrote:
> 
> 
> > We're piling more and more crap in there to support these pte_chains.
> > How much is too much?
> >
> > Is it likely that large pages and/or shared pagetables would allow us to
> > place pagetables and pte_chains in the direct-mapped region, avoid all
> > this?
> 
> On ppc64 shared pagetables will require significant changes to the way
> we handle the hardware hashtable. So add that to the "more and more crap
> in there to support these pte_chains"

Last I heard, pagetable sharing wasn't working out too well
because they all get unshared.
 
> Will shared pagetables be a requirement or can we turn it on per arch?

It's doubtful if per-arch would be an option.

How about this?

- We rely on large pages to solve the Oracle problem

- I'll do pte_chain_highmem and keep that and Bill's patch under test
  in my tree on a wait-and-see basis.  Could go ahead and submit it
  but it's all more complexity, and it'd be nice to actually pull
  something out for a change.

- We'll continue to suck for the University workload.
-
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