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

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Message-ID: <48777E30.8070007@linux-foundation.org>
Date:	Fri, 11 Jul 2008 10:37:20 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mike Travis <travis@....com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

Mike Travis wrote:

> I was thinking that supporting virtual percpu addresses would take a fair
> amount of code that, if living in a MODULE, wouldn't impact small systems.
> But it seems to be not worth the effort... ;-)

For base page mappings that logic is already provided by the vmalloc subsystem. For 2M mappings the vmemmap logic can be used.
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