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Message-Id: <200608301848.39443.ak@suse.de>
Date:	Wed, 30 Aug 2006 18:48:39 +0200
From:	Andi Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH RFC 0/6] Implement per-processor data areas for  i386.

  
> 
> I don't think so.  The whole point is to make the pda easily accessible 
> with simple addressing modes based on %gs:.   I have been wondering if 
> we can modify the percpu mechanism to get the linker to construct the 
> layout of the pda, so that all the existing percpu stuff can be 
> transparently moved into the pda and accessed efficiently.  I think it 
> would be pretty tricky to get it all working though...

I tried that once on x86-64, but it wasn't possible because the linker
is missing the right relocations. It has something on the first look similar 
for __thread data in user space, but it wasn't usable for the kernel.

Even with a single indirection it is still far more efficient than a 
array lookup.

-Andi
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