linux-kernel - Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall page notes

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Date:	Tue, 13 Feb 2007 14:54:26 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Ian Pratt <ian.pratt@...source.com>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>
Subject: Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall
 page notes

Jeremy Fitzhardinge wrote:
> 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.
>   

I'm not super concerned either, but I still don't like it.  There 
already is dynamic replacement for vsyscall.so, so you could have just 
dropped in an an-note-ated version.

Zach
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