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

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Message-ID: <455B611C.3010503@goop.org>
Date:	Wed, 15 Nov 2006 10:49:00 -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:
> but it does not actually use the 'normal usermode TLS selector' - it 
> only loads it.
>
> a meaningful test would be to allocate two selector values and load and 
> read+write memory through both of them.
>   

Well, obviously in one case it would need to switch between
null/non-null/null.  But yes, good point about using the "usermode" %gs
each iteration.  I'll do some more tests.

    J
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