linux-kernel - Re: [rfc 08/45] cpu alloc: x86 support

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Message-ID: <Pine.LNX.4.64.0711201257580.27235@schroedinger.engr.sgi.com>
Date:	Tue, 20 Nov 2007 12:58:34 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	"H. Peter Anvin" <hpa@...or.com>, akpm@...ux-foundation.org,
	travis@....com, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org
Subject: Re: [rfc 08/45] cpu alloc: x86 support

On Tue, 20 Nov 2007, Andi Kleen wrote:

> 
> > This limitation shouldn't apply to the percpu area, since gs_base can be 
> > pointed anywhere in the address space -- in effect we're always indirect.
> 
> The initial reference copy of the percpu area has to be addressed by
> the linker.

Right that is important for the percpu references that can be folded by 
the linker in order to avoid address calculations.

> Hmm, in theory since it is not actually used by itself I suppose you could 
> move it into positive space.

But the positive space is reserved for a processes memory.

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