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[Xen-devel] Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to t

To: Zachary Amsden <zach@xxxxxxxxxx>
Subject: [Xen-devel] Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall page notes
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 13 Feb 2007 14:49:10 -0800
Cc: Andrew Morton <akpm@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
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Zachary Amsden wrote:
> I don't like this because now a kernel compiled with both CONFIG_XEN
> and CONFIG_VMI has "nosegneg" turned on.  We don't actually require
> this for performance or correctness, so it would be nice to be able to
> dynamically turn it off instead of having it forced. 

Any suggestions about how to do this?  It seems hard to have a note
dynamically appear and disappear in the vsyscall.so.

I wasn't terribly concerned about this, since there is effectively zero
performance difference between the two library implementations.

    J

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