linux-kernel - Re: [patch 00/41] cpu alloc / cpu ops v3: Optimize per cpu access

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Message-ID: <87abhuqv7p.fsf@basil.nowhere.org>
Date:	Mon, 09 Jun 2008 21:11:54 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Eric Dumazet <dada1@...mosbay.com>, Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 00/41] cpu alloc / cpu ops v3: Optimize per cpu access

Christoph Lameter <clameter@....com> writes:

> The problem is that offsets relative to %gs or %fs are limited by the 
> small memory model that is chosen.

Actually they are not. If you really want you can do 
movabs $64bit,%reg ; op ...,%gs:(%reg) 
It's just not very efficient compared to small (or rather kernel) model
and also older binutils didn't support large model.

-Andi
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