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

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Message-ID: <4876799B.7010204@linux-foundation.org>
Date:	Thu, 10 Jul 2008 16:05:31 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	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

Jeremy Fitzhardinge wrote:

> Percpu on i386 hasn't been a point of discussion.  It works fine, and
> has been working fine for a long time.  The same mechanism would work
> fine on x86-64.  Its only "issue" is that it doesn't support the broken
> gcc abi for stack-protector.

Well that is one thing and then the scaling issues, and the support of the new cpu allocator, new arch independent cpu operations etc.

> The problem is all zero-based percpu on x86-64.

The zero based stuff will enable a lot of things. Please have a look at the cpu_alloc patchsets.



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