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xen-devel
[Xen-devel] Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to t
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To: |
Zachary Amsden <zach@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall page notes |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Tue, 13 Feb 2007 14:49:10 -0800 |
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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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Tue, 13 Feb 2007 14:48:37 -0800 |
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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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