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

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Message-ID: <4875041C.60206@sgi.com>
Date:	Wed, 09 Jul 2008 11:31:56 -0700
From:	Mike Travis <travis@....com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"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

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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