linux-kernel - Re: [PATCH 8/8] Convert PDA into the percpu section

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Message-ID: <20070306131041.GB9031@elte.hu>
Date:	Tue, 6 Mar 2007 14:10:41 +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 8/8] Convert PDA into the percpu section


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

> Currently x86 (similar to x84-64) has a special per-cpu structure 
> called "i386_pda" which can be easily and efficiently referenced via 
> the %fs register.  An ELF section is more flexible than a structure, 
> allowing any piece of code to use this area.  Indeed, such a section 
> already exists: the per-cpu area.
> 
> So this patch
> (1) Removes the PDA and uses per-cpu variables for each current member.

hmm ... i very much like this, but its needs performance and kernel-size 
testing before it can move from -mm into mainline. We are now exposing 
wide ranges of the kernel to segment prefixes again. (Btw., i'd expect 
there to be a kernel size reduction.)

	Ingo
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