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

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Date:	Fri, 11 Jul 2008 10:36:20 -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:
> H. Peter Anvin wrote:
> ...
>> -- I believe 2 MB mappings are too large, except perhaps as an option.
>>
>>     -hpa
> 
> Hmm, that might be the way to go.... At boot up time determine the
> size of the system in terms of cpu count and memory available and
> attempt to do the right thing, with startup options to override the
> internal choices... ?

Ok. That is an extension of the static per cpu area scenario already supported by cpu_alloc. Should not be too difficult to implement.

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