Message-ID: <4875041C.60206@sgi.com>
Date: Wed, 09 Jul 2008 11:31:56 -0700
From: Mike Travis <travis@sgi.com>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
CC: Christoph Lameter <cl@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       Andrew Morton <akpm@linux-foundation.org>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       "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
References: <20080709165129.292635000@polaris-admin.engr.sgi.com> <4874F4F2.9010603@goop.org> <4874F7D9.5060607@linux-foundation.org> <4874FAB2.5080401@goop.org> <4875000A.3060004@sgi.com> <48750202.3060603@goop.org>
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Jeremy Fitzhardinge wrote:
...
> The trouble with reusing the space is that it's going to be things like
> "current" which are the best candidates for going there - but if you do
> that you lose i386 unification (unless you play some tricks where you
> arrange to make the percpu variables land there while still appearing to
> be normal percpu vars).
> 
>    J


One more approach... ;-)  Once the pda and percpu vars are in the same
area, then could the pda be used for both 32 and 64...?
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