linux-kernel - Re: [PATCH 6/8] Allow per-cpu variables to be page-aligned

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Date:	Tue, 6 Mar 2007 14:15:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH 6/8] Allow per-cpu variables to be page-aligned


* Rusty Russell <rusty@...tcorp.com.au> wrote:

> Xen wants page-aligned GDT (and PDA must not cross a page-boundary, 
> but that doesn't happen at the moment since it's so close to start of 
> page).  Let's allow page-alignment in general for per-cpu data.
> 
> Because larger alignments can use more room, we increase the max 
> per-cpu memory to 64k rather than 32k: it's getting a little tight.

i recently needed page-aligned per-cpu data too for KVM-paravirt. Btw., 
what's the size increase of the native kernel?

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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