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

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Message-ID: <20080709210356.GC4298@elte.hu>
Date:	Wed, 9 Jul 2008 23:03:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Mike Travis <travis@....com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses


* Eric W. Biederman <ebiederm@...ssion.com> wrote:

> Jeremy Fitzhardinge <jeremy@...p.org> writes:
> 
> >> Or we could do something completely evil.  And use the other segment
> >> register for the stack canary.
> >>
> >
> > That would still require gcc changes, so it doesn't help much.
> 
> We could use %fs for the per cpu variables.  Then we could set %gs to 
> whatever we wanted to sync up with gcc

one problem is, there's no SWAPFS instruction.

	Ingo
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