linux-kernel - Re: [RFC 00/15] x86_64: Optimize percpu accesses

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Date:	Wed, 09 Jul 2008 14:31:29 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	Mike Travis <travis@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

Christoph Lameter wrote:
> Mike Travis wrote:
> 
>> I think Jeremy's point is that by removing the pda struct entirely, the
>> references to the fields can be the same for both x86_32 and x86_64.
> 
> That is going to be difficult. The GS register is tied up for the pda area
> as long as you have it. And you cannot get rid of the pda because of the library
> compatibility issues. We would break binary compatibility if we would get rid of the pda.
> 

We're talking about the kernel here... who gives a hoot about binary 
compatibility?

	-hpa

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