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

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Date:	Wed, 09 Jul 2008 13:50:40 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

H. Peter Anvin wrote:
> 1. it means pda references are invalid if their offsets are ever more 
> than CONFIG_PHYSICAL_BASE (which I do not think is likely, but still...)

Why?

As an aside, could we solve the problems by making CONFIG_PHYSICAL_BASE 
0 - putting the percpu variables as the first thing in the kernel - and 
relocating on load?  That would avoid having to make a special PT_LOAD 
segment at 0.  Hm, would that result in the pda and the boot params 
getting mushed together?

    J
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