Date: Wed, 9 Jul 2008 23:03:56 +0200
From: Ingo Molnar <mingo@elte.hu>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, Mike Travis <travis@sgi.com>,
       Christoph Lameter <cl@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       "H. Peter Anvin" <hpa@zytor.com>, Jack Steiner <steiner@sgi.com>,
       linux-kernel@vger.kernel.org
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses
Message-ID: <20080709210356.GC4298@elte.hu>
References: <20080709165129.292635000@polaris-admin.engr.sgi.com> <4874F4F2.9010603@goop.org> <4874F7D9.5060607@linux-foundation.org> <4874FD52.8070000@sgi.com> <4874FFC4.7050505@linux-foundation.org> <487502FB.3090106@sgi.com> <487507A1.2020100@goop.org> <m1r6a2yfip.fsf@frodo.ebiederm.org> <4875212E.6090404@goop.org> <m18wwavkxz.fsf@frodo.ebiederm.org>
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* Eric W. Biederman <ebiederm@xmission.com> wrote:

> Jeremy Fitzhardinge <jeremy@goop.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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