linux-kernel - Re: i386 PDA patches use of %gs

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Message-ID: <455B63D8.7000601@goop.org>
Date:	Wed, 15 Nov 2006 11:00:40 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Arjan van de Ven <arjan@...radead.org>, akpm@...l.org, ak@...e.de,
	linux-kernel@...r.kernel.org, Michael.Fetterman@...cam.ac.uk,
	Ian Campbell <Ian.Campbell@...Source.com>
Subject: Re: i386 PDA patches use of %gs

Ingo Molnar wrote:
> i'd not even use glibc's %gs but set up two separate selectors. (that's 
> a more controlled experiment - someone might run a non-TLS glibc, etc.)
>   

Well, in that case they probably don't care whether the kernel uses %fs
or %gs ;)

But either way, this doesn't have much bearing on Eric's test; we'd be
only talking about a few ns per kernel exit, rather than 5% for read/write.

    J
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